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# Is the positive integer X a prime number? (1) X is a factor of anothe

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DS Forum Moderator
Joined: 21 Aug 2013
Posts: 1412
Location: India
Is the positive integer X a prime number? (1) X is a factor of anothe  [#permalink]

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06 Aug 2018, 09:52
1
00:00

Difficulty:

35% (medium)

Question Stats:

72% (00:48) correct 28% (00:56) wrong based on 32 sessions

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Is the positive integer X a prime number?

(1) X is a factor of another positive integer Y and Y is even.

(2) X is not equal to 2.
Director
Status: Learning stage
Joined: 01 Oct 2017
Posts: 931
WE: Supply Chain Management (Energy and Utilities)
Re: Is the positive integer X a prime number? (1) X is a factor of anothe  [#permalink]

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06 Aug 2018, 10:33
amanvermagmat wrote:
Is the positive integer X a prime number?

(1) X is a factor of another positive integer Y and Y is even.

(2) X is not equal to 2.

I feel safe to note down:-
1. 2 is the only even prime
2. 1 is not a prime.
3. Given 'X' is a positive integer.

Question stem:-Is the positive integer X a prime number?

St1:-X is a factor of another positive integer Y and Y is even

a) If Y=2, then X could be 1 and 2. 1 is not a prime and 2 is a prime
b) If Y=10, then X could be 1,2,5, and 10. 1 and 10 are not prime but 2 and 5 are a prime.

Insufficient.

St2:- X is not equal to 2.
So, X could be any positive integer except 2.-------------(c)
Clearly insufficient.

Combined, we have from(a), X=1 which is not a prime. ($$x\neq2$$)
and we have from (b), X =1,10, and 5 where 1 and 10 are not prime but 5 is a prime.
Insufficient.

Ans. (E)
_________________

Regards,

PKN

Rise above the storm, you will find the sunshine

Re: Is the positive integer X a prime number? (1) X is a factor of anothe &nbs [#permalink] 06 Aug 2018, 10:33
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