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

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**bhavik.shah****Member**- Registered: 2010-08-05
- Posts: 4

now lets see what you have brains or not

5+3+2=151012

9+2+4=183662

8+6+3=482466

5+4+5=202504

then

7+2+5=?????

it's a challenge... prove it.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,832

Hi bhavik.shah;

Welcome to the forum!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,588

Hi!! Welcome!! I think bobby got it right.

**igloo** **myrtilles** **fourmis**

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,832

Hi;

Maybe he did, but shouldn't we ask that big know it all what exactly his thought processes were. Looks like luck to me!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**bhavik.shah****Member**- Registered: 2010-08-05
- Posts: 4

the answer is absolute correct.....

congo man

u such a briliant guy......

the other way to get last two digit number is:

multiply 1st and 2nd=A

multiply 2nd and 3rd=B

and then A+B=CD

and the ans=DC

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,832

Hi bhavik.shah;

Your second method is algebraically the same as my method:

For 3 values a,b,c: Mine is on the left and yours is on the right.

(a + c)b = ab + cb

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

Offline

**bhavik.shah****Member**- Registered: 2010-08-05
- Posts: 4

yes perfect catch

u r such a briliant guy.. bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,832

u r such a briliant guy.. bobbym

It is hard to argue with that unless you are not me.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

Offline

Pages: **1**