Question

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

Answer 1

here is the solution

Answer 2

✌✌Here is your answer ✌ ✌

$\huge\boxed{\red{\bold{Solution}}}$

$\underline{\green{\bold{Let}}}$
N=7×11×13+13
or,
N=13×(7×11+1)
Thus N has at least three factors, i.e, 1, 13 and N itself. 

$\underline{\green{\bold{Let}}}$

M=7×6×5×4×3×2×1+5
or
M=5×(7×6×4×3×2×1+1)
Hence,
M has at least 3 factors, i.e, 1,5 and M self

$\underline{\green{\bold{Note:-}}}$

A composite number-this is a number which has more than 2 factors.

$\underline{\green{\bold{Hence}}}$
by according to definition N and M are composite numbers.

$\huge\underline{\purple{\bold{Thanks}}}$

I hope it helps you ✔