Question

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

Answer 1

Answer:

Step-by-step explanation:

Composite numbers are all natural numbers that are not prime numbers since they can be divided by more than two numbers. 6 is composite, for inst ance, since it is divisible by 1, 2, 3 and even 6.

Answer 2

Answer:

1st case

7*11*13+13 = 13(7*11+1) = 13*78 = 13*2*3*13

Since it has more than two prime factors, it is a composite number.

Similarly,

2nd case

7*6*5*4*3*2*1+5 = 5(7*6*4*3*2*1+1) = 5*1009

Since it has more than two prime factors, it is a composite number.