GRE
The number of different 2-member subsets of a set of 5 members
The number of different 3-member subsets of a set of 5 members
$$3b$$
$$c+9$$
$$x$$
$$y$$
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 number of possible codes of this type
15
The area of triangular region ABG
$$\frac{1}{4}$$ of the area of triangular region ACE
The units digit of $$N^4$$
3
25000 +道题目
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