Question

explain why 7*11*13+13and7*6*5*4*3*2*1+5 are compostive number​

Answer 1

Answer:

Composite numbers are product of prime numbers.

Step-by-step explanation:

7×11×13+13

= 13(7×11×1+1) ...removing 13 common

= 13(77+1)

= 13×78

= 13×13×2×3

Since this expression is product of prime numbers, it is a composite number.

7×6×5×4×3×2×1+5

= 5(7×6×1×4×3×2×1+1) ...removing 5 common

= 5(1008+1)

= 5×1009

Since this expression is product of prime numbers, it is a composite number.

Hope it helps