Question

why 17 x 19 x 23 + 23 and 7 x6 x 5 x 4 x 3 x 2 x 1 + 7 x6 into 5 are composite numbers

Answer 1

=17*19*23+23
=23(17*19+1)
=23(323+1)
=23*324

=>17*19*23+23 has 23 and 324 as its factors.
=>It has more than 2 factors.

Therefore 17*19*23+23 is a composite number.

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