Question

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

Answer 1

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Step-by-step explanation:

7 x 11 x 13 + 13

= 13 (7 x 11 +1)

= 13 x 78

= 13 x 2 x 3 x 13

Since this number can be represented as a product of prime numbers, it is a composite number.

7 x 6 x 5 x 4 x 3 x 2 x 1

= 7 x 3 x 2 x 5 x 2 x 2 x 3 x 2 x 1

This number can be represented as a product of prime numbers, hence it is a composite number.

Answer 2

1. 7 × 11 × 13 + 13 = 1,014

as units place is even no. means it comes in 2 table, hence it is composite no.

2. 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5,040

same as first one.