what is the value of a and b?

In {a, 3, b, a + b}, what is the value of a and b?

(1) a + b is a common prime divisor of 56 and 112.

(2) a and b are prime numbers.

OA: C (highlight to see the answer)

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ratindasgupta: Senior | Next Rank: 100 Posts; Posts: 98; Joined: Mon Jun 11, 2007 10:32 pm; Location: Mumbai

Re: what is the value of a and b?

by ratindasgupta » Sun Aug 05, 2007 12:24 pm

rupam wrote:In {a, 3, b, a + b}, what is the value of a and b?

(1) a + b is a common prime divisor of 56 and 112.

(2) a and b are prime numbers.

OA: C (highlight to see the answer)

Choice A - 56 & 112 have two common prime factors i.e. 2 and 7. INSUFF

Choice B - a and b are prime nos. INSUFF

Together, a and b can only be 2 and 5.
Choice C is the right answer.

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