GRE
The number of positive integers that are factors of both 24 and 30 but are not factors of 20
The number of positive integers that are factors of both 20 and 30 but are not factors of 24
$$5t+4$$
$$0$$
The distance between $$Q$$ and the center of the circle
The length of line segment $$PQ$$
The length of chord $$RS$$
$$6$$
25000 +道题目
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