还有10天考试，求解prep几道数学题。数学很差，哎，怎么办

hjailjh

if n is a multiple of 5 and n=p²q,where p and q are prime numbers,which of the following must be a mutiple of 25?
A.p²
B.q²
C.pq
D.p²q²
E.p²q

of the 12 temporary employees in a certain company,4 will be hired as permanent employees,if 5 of the 12 temporary employees are woman,how many of the possible groups of 4 temporary employees consist of 3 woman and 1 man?
A.22
B.35
C.56
D.70
E.105

DS题做的很差，马上就要考试了，很焦虑……不知道大家有没有什么特别好的复习方法推荐

magi729

第一题，要么p是5，要么q是5，p是5的话n直接是25的倍数，q是5的话因子要有q²,综合得D为答案（应该没错吧啊啊啊啊啊）
第二题，就是个组合问题嘛·····情况有C(3，5)*C(1，7)······（应该是这样啊啊啊啊啊啊）=  =

hjailjh

做完模考忘记记答案了，你说的很对，应该不会有错，非常感谢