Question

Explain why 7 x 13 x 13 + 13 and 7x 6 x 5 x 4 x 3 x 2 x 1 + 5 are composite numbers.
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Answer 1

Answer:

Step-by-step explanation:

7*11*13+13

=13(7*11*1+1)

=13(77+1)

=13(78)

=13*13*3*2

since it has more than two factors it is composite number

7*6*5*4*3*2*1+5

=5(7*6*4*3*2*1+1)

=5(1008+1)

=5(1009)

since it also has more than two factors it is also composite number.

Answer 2

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