2012-04-23 09:00:47

If x is a one-digit integer, which of the following is NOT a possible value of 3 - x?

(A) -7
(B) -3
(C) 0
(D) 3
(E) 7

The correct answer is A

Explanation: The trick to this question is to define a "one-digit integer." That simply means that x must be an integer that is only one-digit long. An integer can be positive or negative (or zero!), so x, in this case, could be -9, -8, -7... 7, 8, or 9.  Each of the answer choices can be created from 3 - x, except for choice A:

(A) 3 - 10 = -7, and 10 is not a one-digit integer
(B) 0 - 3 = -3
(C) 3 - 3 = 0
(D) 3 - -3 = 6
(E) 3 - -4 = 7