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  3. How many different positive integers are factors of 342?

How many different positive integers are factors of 342?

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问题 How many different positive integers are factors of 342?
选项 A、9
B、11
C、12
D、20
E、22
答案C
解析 From the answers we can see that the list of factors will be relatively small, so it’s easiest just to list them out. The pairs of factors are 1 and 342, 2 and 171, 3 and 114, 6 and 57, 9 and 38, and 18 and 19. That makes 12 factors.
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