Question

explain why 7 x 11 x 13 + 13 and 7 x 6 x 5 x 4 x 3 x 2 X 1 + 5 are composite number

Answer 1

this answer may help you

Answer 2

Step-by-step explanation:

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.