Question

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

Answer 1

Hey!!

7×11×13+13=13(7×11+1)

7×6×5×4×2×1+5=5(7×6×4×3×2+1)

hence these numbers have more than two factors. so they are composite numbers.

Answer 2

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