扫描二维码，直接登录
题库 / Prep2007E1-DS-35
If p and n are positive integers and p > n, what is the remainder when p2 - n2 is divided by 15 ?
(1) The remainder when p + n is divided by 5 is 1.
(2) The remainder when p - n is divided by 3 is 1.
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.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
设5a+1=p+n, 3b+1=p-n 所以(5a+1)*(3b+1)=p2-n2=15ab+5a+3b+1=15ab+2p-1，不知道2p，不充分。
登录 或 注册 后可以参加讨论