Question

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

Answer 1

Hey

1) 7 × 11 × 13 + 13

13(7×11×1 + 1)

13(77+1)

13(78)

Therefore it is a composite number

2) 7 × 6 × 5 × 4 × 3 × 2 +5

5(7×6×1×4×3×2 + 1)

5(42×24+1)

5(1009)

Therefore it is a composite number