******请教OG_Math中三道题目

If n is an integer, then n is divisible by how many positive integers?
(1) n is the product of two different prime numbers.
(2) n and 2 3 are each divisible by the same number of positive integers.
答案是each statement alone is sufficient.可是我认为(1)是不充分的，如果two different prime numbers之中有一个是1(1也是prime number)，那么就不能判断n到底能被几个数整除，可能是4个(两个数都不是1)，可能是2个(两个数中有一个是1)。

In ΔPQR, if PQ = x + 2, and PR = y, which of the three angles of ΔPRQ has the greatest degree measure?
(1) y = x + 3
(2) x = 2
答案是statement (1) ALONE is sufficient, but statement (2) alone is not sufficient。可是我认为both the statements are not sufficient，因为题目问的是三角形中最大的角(即最长的边)，并不是比较PQ和PR两条边的长短。

If • represents one of the operations +, –, and ×, is K·(I+M )=(K·I )+(K·M) for all numbers l , k and m?
(1)  K·I is not equal to I·K for some numbers k.
(2) •represents subtraction.
题目的问题看不懂…………

请赐教！！