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
up
sorry
from 81 to 99
81 82 83 84 ....89
90 91 ... 99
8 and 9 aren't prime number
[此贴子已经被作者于2004-12-21 13:45:43编辑过]
以下是引用mikejia在2004-12-21 13:43:00的发言：sorry
from 81 to 99
81 82 83 84 ....89
90 91 ... 99
8 and 9 aren't prime number
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