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

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Solution

Given
7x13x11+11
=11(7x13+1)
=11(92)
So it can written as a product of 2 so it is a composite number
7x6x5x4x3x2x1+3
=3(7x6x5x4x2x1+1)
=3(1681)
So it can written as a product of 2 so it is a composite number

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