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标题: [求助]天山-4-32 [打印本页]

作者: mingzhu11 时间: 2005-10-25 06:33 标题: [求助]天山-4-32

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.

The answer is B but my answer is E

(1) (1+8=prime) 81＞80 18＜80 , so wrong

(2) 79＜80 97＞80, so wrong

(1)+(2) 29＜80 92＞80 ,so the answer is E

作者: sammen 时间: 2005-10-25 12:23

质数,2,3,5,7,那么可以有的组合75,73,72...都是小于80的啊,所以充分.

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