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Algebra

Cool goIITian

 Joined: 31 Mar 2012 Post: 81
31 Mar 2012 17:36:58 IST
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PROBABILITY
Engineering Entrance , JEE Main , JEE Main & Advanced , Mathematics , Algebra

probability of selecting two numbers A,B such that A+B is divisible by 7 where A,B belongs to natural numbers (dont think probability for this cannot exist )

#### Comments (6)

New kid on the Block

Joined: 19 Mar 2012
Posts: 11
1 Apr 2012 14:31:10 IST
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1/7 ?

Cool goIITian

Joined: 31 Mar 2012
Posts: 81
1 Apr 2012 22:20:08 IST
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nooooooo

Cool goIITian

Joined: 31 Mar 2012
Posts: 81
1 Apr 2012 22:20:23 IST
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not so easy ...

Cool goIITian

Joined: 31 Mar 2012
Posts: 81
6 Apr 2012 19:47:04 IST
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no one is answering :((

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
6 Apr 2012 19:53:26 IST
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what is rule of divisibilty of 7 i dont think so ki koi h

Blazing goIITian

Joined: 27 Dec 2010
Posts: 1508
9 Apr 2012 12:01:11 IST
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@tarun  - google pe search karo bhai. there are methods to do that. simple methods.

A = (0,1,2,3,4,5,6) mod 7.

B = (0,1,2,3,4,5,6) mod 7.

so total ways to select A and B = 7*7 = 49.

favourable cases are (0,0), (1,6), (2,5), (3,4), (4,3), (5,2), (6,1).

agey khud karlo.

i think this must be the way..

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