Question

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

Answer 1

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given numbers are

7×11×13+13 and

7×6×5×4×3×2×1+5

⇒ 13(7×11+1) and 5(7×6×4×3×2×1+1)

⇒ 13 K and 5 L,

where K=78 and L=1009

As these given numbers can be written as product of two numbers, they are composite numbers.....

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