GWD数学第15套32题

甜蜜小乌龟 · 发表于 2011-7-29 21:50:18

Q32:
If n is an integer between 10 and 99, is n < 80 ?
(1)The sum of the two digits of n is a prime number.
(2)Each of the two digits of n is a prime number.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

这个题答案是B为什么啊我选的是D

clot1987 · 发表于 2011-7-29 21:54:10

肯定是B啊。

因为a的话有可能是 23 2+3=5

也有可能是 92 9 + 2 = 11

不确定n是否< 或者>80

GWD数学第15套32题

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