GMAT Data Insights: Data Sufficiency 2

Question 1

In a Data Sufficiency problem, what does answer choice C indicate?

Accepted Answer

Both statements together are sufficient, but neither alone is sufficient

Answer

Choice C means the two statements together suffice, but neither is enough on its own.

Question 2

Is x > 0? (1) x^2 = 9 (2) x^3 = 27

Accepted Answer

Statement (2) alone is sufficient

Answer

x^2=9 gives x=±3 (insufficient), but x^3=27 gives only x=3, so (2) alone is sufficient.

Question 3

What is the value of integer n? (1) n is a prime number less than 5 (2) n is even

Accepted Answer

Both together but neither alone

Answer

Primes under 5 are 2 and 3; only 2 is even, so combining the statements gives n=2.

Question 4

Is the integer k divisible by 6? (1) k is divisible by 3 (2) k is divisible by 4

Accepted Answer

Both together but neither alone

Answer

Divisibility by 3 and by 4 forces divisibility by 12, which guarantees divisibility by 6.

Question 5

A common error in Data Sufficiency is to do what?

Accepted Answer

Solve for the exact value when only sufficiency is needed

Answer

You only need to determine if the answer can be found, not calculate the final number.

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