jay2912 jay2912

21-12-2015
Mathematics

contestada

which of the following is a composite number 63 ,31, 13 ,61

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WorldCitizen WorldCitizen

21-12-2015

A composite number is a number that is not prime, that is, it has factors.

Here, it's 63: it's divisible by 3:

63/3=21

and then by 3 again:

21/3=7

and only 7 is a prime.

so 63 is the answer

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