Question

Q. 13
Explain why 7 * 11 * 13 + 13 and
7 * 6 * 5 * 4 * 3 * 2 * 1 + 5 are composite numbers ?​

Answer 1

Step-by-step explanation:

What is a composite number?

A number which has factors or multiplies other than the number itself and one are known as composite numbers

Implies,

Composite numbers should have more than 2 Factors

1. 7×11×13+13

Taking 13 as common,

=13(7×11+1)

=13×78

=13×13×6

=2×3×13²

Thus,the product of above numbers is composite

2. 7×5×4×3×2×1+5

Taking 5 common,

=5(7×1×4×3×2×1+1)

=5×169

=5×13²

Hence,the product of given numbers is a composite number

I hope it helps you