show that 17*11*9*7+7 is a composit number
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The numbers are prime numbers and composite numbers.
Prime numbers can be divided by 1 and itself.
A composite number has factors other than 1 and itself.
(17*11*2)+(17*11*5)
(17*11)(2+5)=17*11*7
The given expression has 7,11 and 17 as its factors.
∴ It is a composite number.
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