Explain why 3*5*7*+7 is a composit number
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as it is being multiplied by 3(3×5×7) numbers so it dies have factors other than 1 and itself therefore it is composite
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=3*5*7+7
= 7(3*5*7+1)
= 7(105+1)
= 7(106)
= 742
and 742 is a composit number so 3*5*7+7 is also composit number
= 7(3*5*7+1)
= 7(105+1)
= 7(106)
= 742
and 742 is a composit number so 3*5*7+7 is also composit number
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