Q15:
If w, x, y, and z are integers such that 1 < w < x < y < z and wxyz = 462, then z =?
A. 7
B. 11
C. 14
D. 21
E. 42
Answer: b
我知道b行但是a 为什么不行呢?比如2*3*11*7
462=2*3*7*11
所以z=11
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