GRE
x
100
The number of different groups of 2 kittens that can be chosen from a litter of 8 kittens
The number of different groups of 6 puppies that can be chosen from a litter of 8 puppies
The probability that exactly two adjacent digits of the number selected will be the same
$$\frac{1}{5}$$
p
$$\frac{1}{2}$$
The probability that both x and y will be even
The probability that x+y will be even
25000 +道题目
6本备考书籍