Question

explaine why 7*11*13*15+15 is a composite number

Answer 1

7 *11*13*15+15

now .....

15 is common then ....

15(7*11*13*1+1)

15(1002)

15030

this proves multiplying composite with composite gives composite

i.e. composite × composite = composite

Answer 2

7*11*13*15+15

=15(7*11*13*1+1)

=15(77*13+1)

=15(1001+1)

=15(1002)

15 has more than two factors, that is why it is a composite number.

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