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Is $7\times11\times13+13$ a composite number? Justify your answer.
Given: $7\times11\times13+13$
To do: To find weather the given number is composite? and To justify.
Solution:
As given $7\times11\times13+13$
$=13\times(7\times11+1)=13\times78$
This number is multiple of two integers. Hence it has more than two factors. Hence it is a composite number.
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