explaine why 7*11*13*15+15 is a composite number
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2
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
Answered by
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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