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Question

A and B are whole numbers. A has exactly 2 factors. B has exactly 4 factors. C is the product of A and B. At least how many factors does C have?

MCQ options: 4, 5, 6, 8

Source: Nanyang Primary

Answer

Let A be 3 and B be 27.

3 x 27 = 81 which will be C.

5 factors of C, 12 are 1, 3, 9, 27 and 81.

Ans : 5.

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