Question

explain why 7 × 6 × 5 × 4 × 3 × 2 ×1 + 5 is a composite number​

Answer 1

because on solving this a number yoy will get

would have more than two factors . so it is a composite number.

Answer 2

$7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 + 5$

Taking out common 5

$5(7 \times 6 \times 4 \times 3 \times 2 \times 1 + 1)$

$5(1008 + 1)$

$5(1009)$

5 × 1009 = 5045

It is clearly seen that the number going to obtain is multiple of 5 and 1009

so, it was composite number

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