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题库 / Prep2007E1-DS-77
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.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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条件1：取8和3的和是prime number，n>80。条件2：十位数最大质数只能是7，所以n
条件2，如果数大于80，因为8.9都不是质数，所以不满足条件，即这个数一定小于80
条件1：取8和3的和是prime number，n>80。条件2：十位数最大质数只能是7，所以n