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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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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

"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

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 agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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Oh. My classmate taught me that T thing.

Number 14 28 42

Operation + - [sup]2[/sup]

Answer 1764

"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

42^2 = 1764

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
- Website

New edition :

P * C.P = 5

P = Prime

C = Composite

"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?

3.141592653589793238...

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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'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

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.

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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C.P means decimal number. Try again.

3.141592653589793238...

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**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)*

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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Oh, well.

No answers, no points.

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

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

Hi;

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

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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81 + X - 4 = 85

Solve for X.

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

Hi;

Thanks for the answer.

X = 0

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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Again!

81 + X - 4 = 85

You might have an error.

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

H;

81 + X - 4 = 85

Add 4 to both sides:

81 + X = 89

Subtract 81 from both sides.

X = 8

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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Wow.

1777 - 777 + 777 * 777 = ?

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

604729 is the answer.

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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Wow!

This time, there are points.

X + X = X

What makes this impossible to answer? 30 points

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

Nothing, X can be 0.

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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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)*

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

I like 21 as the nest number.

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

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
- 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?

3.141592653589793238...

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,753

Is it 123 456 ?

How are the chickenpox?

**In mathematics, you don't understand things. You just get used to them.**

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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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?

3.141592653589793238...

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