Question

is 7x6x5x4x3x2x1+5, a composite number? justify your answer

Answer 1

5 (7 × 6 × 1 × 4 × 3 × 2 × 1 + 1)
here 5 is a composite no. so it's factor
(7 × 6 × 1 × 4 × 3 × 2 × 1 + 1) will also be a composite no.

Answer 2

Yes because
7x6x5x4x3x2x1+5
= 5(7x6x4x3x2x1+1)
= 5(1008+1)
= 5(1009)
Since it has more than 1 factor that is 5 and 1009
So it is a composite number