If there are fewer than 8 zeroes between the decimal point and the first nonzero digit in the decimal expansion of (t/1000)^4, which of the following numbers could be the value of t?

I. 3

II. 5

III. 9

(A) None

(B) I only

(C) II only

(D) III only

(E) II and III

Correct Answer: C

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For which of the following functions is f(a+b) = f(b) + f(a) for all positive numbers a and b?

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This is one of the most difficult questions in the GMAT universe. That said, there is a simple way to solve it that relies on a fundamental divisibility rule every GMAT studier should know:

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