Question

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

Answer 1

Answer:

because they are all odd number except 4

Step-by-step explanation:

Answer 2

Answer: Given 7×11×13+13

=13×(7×11+1)=3×78  

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.

similarly in

7×6×5×4×3 ×2×1+5    

=5(7×6×4×3 ×2×1+1)=5×1009    

This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.