# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1151 2021-02-14 05:18:38

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1152 2021-02-14 15:23:50

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Neat work!

SP#647. Find the number of terms in the Arithmetic Progression 18, 15½, 13, ...., -49½ and also find the sum of all its terms.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1153 2021-02-15 04:27:10

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1154 2021-02-15 15:12:16

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Keep it up!

SP#648. The 19th term of an Arithmetic Progression is equal to three times its 6th term. If its 9th term is 19, find the first three terms of the Arithmetic Progression.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1155 2021-02-16 05:06:25

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1156 2021-02-16 16:26:26

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Excellent!

SP#649. Find the sum of all multiples of 7 lying between 500 and 900.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1157 2021-02-17 04:12:42

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1158 2021-02-17 14:51:00

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Brilliant!

SP#650. An Arithmetic Progression 5, 12, 19, ... has 50 terms. Find its last term. Hence, find the sum of its last 15 terms.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1159 2021-02-18 04:57:35

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1160 2021-02-18 14:44:19

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Excellent!

SP#651. Find the 60th term of the Arithmetic Progression 8, 10, 12, .. if it has a total of 60 terms and hence find the sum of its last 10 terms.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1161 2021-02-19 04:49:14

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1162 2021-02-19 15:05:30

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Excellent!

SP#652. If the sum of first 4 terms of an Arithmetic Progression is 40 and that of first 14 terms  is 280, find the sum of its first n terms.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1163 2021-02-20 04:39:37

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1164 2021-02-20 15:10:37

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Splendid!

SP#653. Find the sum of natural numbers between 101 and 999 which are divisible by 2 and 5.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1165 2021-02-21 04:16:09

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1166 2021-02-21 15:33:07

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Brilliant!

SP#654. The sum of first ten terms of an Arithmetic Progression is 195 and sum of next ten terms of the Arithmetic Progression is 495. Find the common difference 'd'.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1167 2021-02-22 03:40:33

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1168 2021-02-22 15:33:22

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Excellent!

SP#655. Find the number of terms in an Arithmetic Progression whose first and last terms are -13 and 47 and whose sum is 272.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1169 2021-02-23 04:39:32

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

Offline

## #1170 2021-02-23 15:33:57

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Excellent!

SP#656. Find the sum of first 100 even natural numbers divisible by 3.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1171 2021-02-24 04:24:23

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1172 2021-02-24 16:00:32

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

SP#657.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1173 2021-02-25 05:03:42

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

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## #1174 2021-02-25 15:10:52

ganesh
Registered: 2005-06-28
Posts: 33,179

### Re: Series and Progressions

Hi,

Excellent!

SP#658.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #1175 2021-02-26 07:56:47

irspow
Member
Registered: 2005-11-24
Posts: 1,055

### Re: Series and Progressions

I am at an age where I have forgotten more than I remember, but I still pretend to know it all.

Offline