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题库 / Prep2007E2-DS-112
If m and n are positive integers and mn = k, is m + n = k + 1 ?
(1) m = 1
(2) k 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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条件一：m=1 则，n=k. 所以，m+n=1+k
条件二：k为质数，则k的因数只能是1和它本身。nm=k, m或者n等于1,则，n或者m等于k。所以，m+n=1+k
竟然忘了质数不得被除