17. The correct answer is (E). Statement (1) alone provides no number values and
therefore is obviously insufficient to answer the question. Statement (2) alone provides
the value of one number, but the value of all three numbers is needed to compute their
average. Considered together, statements (1) and (2) still allow for many possibilities.
Statement (2) tells us that one (and only one) of the three numbers equals 0. Combining
this fact with statement (1), the other two numbers might either have the same positive
value or they might be additive reciprocals. If the three numbers are 0, 2, and 2, for
example, then the average of the three numbers 5 (0 1 2 1 2) 4 3 5 4
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