Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
1. p is odd.
2. 41 < p < 49
OA: E
Primes
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Both statements taken together, p can is either 43 or 45 or 47.Troika wrote:Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
1. p is odd.
2. 41 < p < 49
Now, 43 and 47 cannot be expressed as the product of two integers, each of which is greater than 1 but 45 can be.
Hence, both statements together is also not sufficient to answer the question.
The correct answer is E.
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The statements together do not point that p is equal to 45, they point that p can be either 43 or 45 or 47.Troika wrote:Anurag, since 45 can be expressed as the product of two integers greater than 1 (5 x 9), shouldn't the answer be C?
Now, for p = 43 and p = 47, the answer to the question is NO
And for p = 45, the answer to the question is YES
Hence, we cannot properly answer the question.
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Hi!Troika wrote:Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
1. p is odd.
2. 41 < p < 49
OA: E
Like a lot of data sufficiency questions, investing a bit of time in the question stem to understand what the question is really about makes working with the statements much simpler.
Let's break down the stem:
What kind of positive numbers CANNOT be expressed as the product of two integers greater than 1? Primes! So, here's what the question is really asking:Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
and, of course, since a "yes" answer to that question is the same as a "no" answer to "Is the positive integer p prime?", we could just rephrase the question that way as well.Is the positive integer p non-prime?
So, now we know what we're after: is the positive integer p prime?
(1) p is odd
Some primes are odd, some non-primes are odd (e.g. 13 and 15) - insufficient.
(2) p is between 41 and 49
41 is non-prime, 43 is prime - insufficient.
Together: 43, 45 and 47 all satisfy both statements. 43 is prime, 45 isn't: still insufficient, choose E!
Stuart Kovinsky | Kaplan GMAT Faculty | Toronto
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