Question

Explain why (13 x 11 x 5 x 2 + 5 x 13) is a composite number?​

Answer 1

Answer:

13 x 11 x 5 x 2 + 5 x 13

= 13 (11 x 5 x 2 + 5)

= 13 x 115

Since the no. has factors 13 and 115 other than 1 and the no. itself, it is a composite no.

Hence proved.

Hope this helps :)