Question

explain why 7 *11 *13 +13 and 7 *6 *5 *4 *3 *2 *1 +5 are composite numbers?

Answer 1

Given,
7 × 11 × 13 + 13 = 13 ( 7 × 11 + 1 )
This number has a factor of 13. So it is a composite number.
Same follows in the second number.
7 × 6 × 5 × 4 × 3 × 2 × 1 + 5
= 5 (7 × 6 × 1 × 4 × 3 × 2 × 1 + 1)
This number has a factor of 5 So it is a composite number.
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