Question

Prove that 7×11×13+13 and 7×6×5×4×3×2×1+5 are composite numbers

Answer 1

Answer:

7×11×13+13 = 13(7×11+1)

= 1014

7×6×5×4×3×2×1+5 = 5(7×6×4×3×2×1+1)

= 1013

Yes, they are composite no. as they have 13 and 5 as there factor.

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