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

You are not logged in.

- Topics: Active | Unanswered

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Good!

Example:

T[sub]4[/sub] means that you need to get the 5th triangular number because T[sub]0[/sub] is 1, the first triangular number.

Okay!

Next question:

Numbers 3 4 5

Operations T +

Answer 46

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

Hi;

The first triangular number is 0, so T0 = 0.

But using your definition we can say

T3 + T4 + T5 = 46

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Oh. My classmate taught me that T thing.

Number 14 28 42

Operation + - [sup]2[/sup]

Answer 1764

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

42^2 = 1764

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

New edition :

P * C.P = 5

P = Prime

C = Composite

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

it can't be.

5 = 5*1 and there isn't any other factorisation

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

Hi julianthemath;

5 only has the factorization of 5 x 1. 1 is not composite or prime. Please post another problem this one has no solution.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

C.P means decimal number. Try again.

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**mathdad****Member**- Registered: 2013-04-13
- Posts: 21

julianthemath wrote:

New edition :

P * C.P = 5

P = Prime

C = Composite

Still not possible.

All P are such that P > 1. The smallest P is 2. And, the smallest C such that C > 0 is 4

Thus P * C.P >= 2 * 4.d = 8.0 + 2d (where 2d is 2 times the decimal part)

If you were trying to go for 2 * 2.5, then the 2 in 2.5 is not Composite, it is Prime.

*Last edited by mathdad (2013-04-22 09:04:17)*

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Oh, well.

No answers, no points.

Wanna ask, mathdad? bobbym? Or just keep me?

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

Hi;

Okay, let me see the answer. Please hide the answer cause someone else may still want to work on it.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

81 + X - 4 = 85

Solve for X.

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

Hi;

Thanks for the answer.

X = 0

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Again!

81 + X - 4 = 85

You might have an error.

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

H;

81 + X - 4 = 85

Add 4 to both sides:

81 + X = 89

Subtract 81 from both sides.

X = 8

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Wow.

1777 - 777 + 777 * 777 = ?

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

604729 is the answer.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Wow!

This time, there are points.

X + X = X

What makes this impossible to answer? 30 points

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

Nothing, X can be 0.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Oh. How do you like my signature? Funny, right?

Bobbym - 30

3 6 9 15 ? What is the fifth number?

*Last edited by julianthemath (2013-04-25 21:01:50)*

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

I like 21 as the nest number.

I worked a long time on bobbym - 30 but could not come up with anything.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

Oh.

Bobbym - 60

If China has a population of 1,234,567,890,

India 123,456,789

USA 12,345,678

Indonesia 1,234,567

What is the population of Brazil?

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

Is it 123 456 ?

How are the chickenpox?

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,809
- Website

No. I didn't have it, my cousins do. The start of the infection was during the afternoon I came home after my last exams. And now, some of my cousins are having the chickenpox. So, I just need to stay inside.

Yes. It is 123,456.

Bobbym - 90

If Gangnam style were a country (by no. of views), what rank is it?

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline