Home » Ask & Discuss » Mathematics
« Back to Discussion

Algebra

Cool goIITian

Joined:	31 Mar 2012
Post:	81

31 Mar 2012 17:36:58 IST

0 People liked this

423

PROBABILITY

Engineering Entrance , JEE Main , JEE 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)

Neha

New kid on the Block

Joined: 19 Mar 2012

Posts: 11

1 Apr 2012 14:31:10 IST

Like 0 people liked this

1/7 ?

saikrishna

Cool goIITian

Joined: 31 Mar 2012

Posts: 81

1 Apr 2012 22:20:08 IST

Like 0 people liked this

nooooooo

saikrishna

Cool goIITian

Joined: 31 Mar 2012

Posts: 81

1 Apr 2012 22:20:23 IST

Like 0 people liked this

not so easy ...

saikrishna

Cool goIITian

Joined: 31 Mar 2012

Posts: 81

6 Apr 2012 19:47:04 IST

Like 0 people liked this

no one is answering :((

Tarun Garg

Blazing goIITian

Joined: 21 Mar 2012

Posts: 1457

6 Apr 2012 19:53:26 IST

Like 0 people liked this

what is rule of divisibilty of 7 i dont think so ki koi h

hemang

Blazing goIITian

Joined: 27 Dec 2010

Posts: 1508

9 Apr 2012 12:01:11 IST

Like 0 people liked this

@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..

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team