# Math Is Fun Forum

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

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## #326 2020-04-28 16:11:44

Jai Ganesh
Registered: 2005-06-28
Posts: 43,477

### Re: *** Problems

To find the probability of event A or B, we must first determine whether the events are mutually exclusive or non-mutually exclusive. Then we can apply the appropriate Addition Rule:

Addition Rule 1: When two events, A and B, are mutually exclusive, the probability that A or B will occur is the sum of the probability of each event.

P(A or B) = P(A) + P(B)

Addition Rule 2: When two events, A and B, are non-mutually exclusive, there is some overlap between these events. The probability that A or B will occur is the sum of the probability of each event, minus the probability of the overlap.

P(A or B) = P(A) + P(B) - P(A and B).

Your solution is correct. Good work!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

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## #327 2020-05-02 23:04:52

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

The solution of #304 is r=5.

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #328 2020-05-02 23:53:37

Jai Ganesh
Registered: 2005-06-28
Posts: 43,477

### Re: *** Problems

Hi,

Neat work!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

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## #329 2020-05-04 05:02:25

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

The solution of #259 is  n=35

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #330 2020-05-04 14:16:43

Jai Ganesh
Registered: 2005-06-28
Posts: 43,477

### Re: *** Problems

Hi,

Excellent!

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

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## #331 2020-05-06 04:42:37

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

Solution to #311 is (1/3).

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #332 2020-05-06 14:10:57

Jai Ganesh
Registered: 2005-06-28
Posts: 43,477

### Re: *** Problems

Hi,

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

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## #333 2020-05-06 19:15:02

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

Solution for#254 is [(2) / (x-2)(x-4)]

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #334 2020-05-25 20:37:19

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

The solution for #262 is -(a+nd).

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #335 2020-06-10 02:32:02

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

Solution of #331: The values are
a=-13
b= 8

Last edited by 666 bro (2020-06-10 04:48:45)

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #336 2020-06-13 02:20:29

666 bro
Member
From: Flatland
Registered: 2019-04-26
Posts: 706

### Re: *** Problems

The solution for #277 is 6

"An equation for me has no meaning, unless it expresses a thought of God"- Srinivasa ramanujan

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## #337 2020-06-13 04:12:15

Jai Ganesh
Registered: 2005-06-28
Posts: 43,477

### Re: *** Problems

I am unable to check *** problems for some time

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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

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