1. If a? = 12, then a4 =
A. 144
B. 72
C. 36
D. 24
E. 16
Correct Answer: A
解析:
a4 = a2 x a2 = 12 x 12 = 144
2. If n is even, which of the following cannot be odd?
I n + 3
II 3n
III n? - 1
A. I only
B. II only
C. III only
D. I and II only
E. I, II and III
Correct Answer: B
解析:
In case I , even plus odd will give odd. In case II, odd times even will give even. In case III even squared is even, and even minus odd is odd. (You can check this by using an easy even number like 2 in place of n). Only case II cannot be odd.
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