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# Doubt for a DS question.

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Intern
Joined: 19 Sep 2014
Posts: 1
WE: Engineering (Manufacturing)
Doubt for a DS question.  [#permalink]

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12 Jul 2018, 17:45
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0% (00:00) correct 0% (00:00) wrong based on 1 sessions

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If and b are positive integers, what is the value of b?
1: 2^a.7^b=1372
2:a=2

Director
Status: Learning stage
Joined: 01 Oct 2017
Posts: 860
WE: Supply Chain Management (Energy and Utilities)
Doubt for a DS question.  [#permalink]

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12 Jul 2018, 20:56
1
rajmishra88 wrote:
If and b are positive integers, what is the value of b?
1: 2^a.7^b=1372
2:a=2

Hi,

Statement-1
Since bases of LHS contain prime numbers,hence we need to determine the prime factorisation of RHS(1372).
$$1372=2^2*7^3$$
So, $$2^a*7^b=2^2*7^3$$
Or, a=2 and b=3
So, sufficient.

Statement-2
Given a=2. But no information on 'b' is provided. So, 'b' can be any positive integer.
So, insufficient.

Ans. (A)

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Doubt for a DS question. &nbs [#permalink] 12 Jul 2018, 20:56
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# Doubt for a DS question.

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