Question

Explain why 7 x 11 x 13+13 and 7 x6x5x4 x 3 x 2 x 1 +5 are composite numbers​

Answer 1

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Given 7×11×13+13

=13×(7×11+1)=3×78

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.

similarly in

7×6×5×4×3 ×2×1+5

=5(7×6×4×3 ×2×1+1)=5×1009

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.