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If p and q are prime numbers, what is the number of the diff

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by Max@Math Revolution » Wed Jun 12, 2019 9:28 pm

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A

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D

E

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[GMAT math practice question]

If p and q are prime numbers, what is the number of the different factors of p^2q^3?
1) pq=143
2) p and q are different
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Source: — Data Sufficiency |
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by Max@Math Revolution » Sun Jun 16, 2019 9:49 pm
Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.

The first step of the VA (Variable Approach) method is to modify the original condition and the question. We then recheck the question. We should simplify conditions if necessary.

Since p and q are prime numbers, condition 1) tells us that p = 11 and q = 13, or p = 13 and q = 11. Therefore, since p and q are different prime numbers, the number of different factors of p^2q^3 is (2+1)(3+1) = 12. Condition 1) is sufficient since it yields a unique solution.


Condition 2)
Since condition 2) tells us that p and q are different prime numbers, the number of factors of p^2q^3 is (2+1)(3+1) = 12.
Condition 2) is sufficient since it yields a unique solution.

Therefore, D is the answer.

Note: Tip 1) of the VA method states that D is most likely to be the answer if condition 1) gives the same information as condition 2).
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