Question

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

Answer 1

Hey!

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Q - 7 × 11 × 13 × 13

= 13 × 17 × 11 + 1

= 13 × (17 × 11 + 1)

= 13 × (77 + 1)

= 13 × 13 × 3 × 2

•This number has more than 2 factor thus this is composite number

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Q - 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5

= 5 × 7 × 6 × 4 × 3 × 2 × 1 + 1

= 5 × (7 × 6 × 4 × 3 × 2 × 1 + 1

= 5 × 1008 + 1

= 5 × (1008 +1)

= 5 × 1009

•This number has more than 2 factor thus this is composite number

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Regards :)

Cybary

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