why 11×12×15×17+17 is a composite number
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11×12×15×17+17
=11(1+1980)
=11×1981
=21791
now 21791=1981×11
since it is a product of more than one factor
so it is a composite number
=11(1+1980)
=11×1981
=21791
now 21791=1981×11
since it is a product of more than one factor
so it is a composite number
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