问几道SAT概率数学题

题目

问几道SAT概率数学题
没学过高中概率,希望讲的详细一些.
1.If p,r,m,n,t and s are six different prime numbers greater than 2,and n=p*r*s*m*n*t,how many positive factors,including 1 and n,does n have?
2.If someone throws a dice twice,on the first time he gets a points,and on the second he gets b points,what is the probability a/b>1?
3.Mr.Jones must choose 4 of the following 5 flavors of jellybean:apple,berry,coconut,kumquat,and lemon,How many different combinations of flavors can Mr.Jones choose?
4.有5张卡片,其中的一张A永远都不在两边,问有多少种排列方式

答案

1, 这个问题你检查一下对吗? n=p*r*s*m*n*t,两边都有n 啊?还六个数都不相等.
2,（a）你先求两次一样的概率,你第一抛的不管是啥,第二次再取到这个值的概率是1/6.（b）不相等的概率知道了吧?5/6.（c）a/b>1和a/b