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Let x in {2, 3, 4} and y in {4, 6, 9, 10...

Let x `in` {2, 3, 4} and y `in` {4, 6, 9, 10}. Let A be the set of all order pairs (x, y) such that x is a factor of y. How many elements does the set A contain ?

A

12

B

10

C

7

D

6

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