Question

explain why 15*7+7 is a composite number

Answer 1

7(15+1)
7 is a factor of 15*7+7
so that's why its a composite no.

Answer 2

15×7+7
=7(15+1)

A composite number has 2 factors other than 1 an the number itself
here the given no has two factors
7 and (15+1)

so the given no is composite no
hope it helps
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