Question

Explain why 7× 11 × 13 + 13 and 7 × 6 × 5 × 4 ×3 × 2 × 1 + 5 are composite number

Answer 1

Step-by-step explanation:

In 7*11*13+13 :

13(7*11*1+1)

13(77+1)

13(78)

=1014 (it is a composite number because it is divisible by 2,13 and also by itself)

In 7*6*5*4*3*2*1+5:

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

5(1008+1)

5(1009)

= 5045(it is a composite number because it is divisible by 5, and itself)

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Answer 2

Answer:

because they both have two factors rather than 1