Question

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

Answer 1

Answer:

The numbers which are not prime and numbers having factors other than one and itself are called as composite numbers.

So factors are 13 x 13 x 3 x 2 which has the value equal to 1014 and has more than one factor. So it is a composite number.

We get 1009 x 5 = 5045 which is a composite number.

I hope it may help you

Answer 2

7×11×13+13 is composite becoz it is divisible by 13.

7×6×5×4×3×2×1+5 is composite becoz it is divisible by 5.