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5 March, 21:52

Which of the following is a composite number?

A. 31

B. 63

C. 61

D. 13

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Answers (2)
  1. 5 March, 23:21
    0
    A composite number is an integer that is NOT prime.

    Here is a trick: if you add the digits of a number and this sum divides by 3, the number is divisible by 3:

    so B) 63

    6+3=9

    which is divisible by 3, and so is 63: this is a composite number
  2. 6 March, 00:54
    0
    The answer is b b is composite
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