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题库 / Prep2007E2-DS-26
If x and y are integers, is the value of x(y + 1) even?
(1) x and y are prime numbers.
(2) y > 7
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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（1） x=2， y=3， 偶数，y=2，x=3，奇数 不充分；（2）y>7,不充分 （1）+（2），y肯定是奇数，y+1是偶数，乘机是偶数。C
忘了质数里有个2