Answers

2016-02-15T21:14:06+05:30
3 x 5 x 7 +7 = 7(3 x 5 x 1+1) =7 x 16 = 112 ,so it is composite number because the factor is more than 1 .
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2016-02-15T21:15:59+05:30
Any integer greater than one that is not a prime number is a composite number.
here,7*(3*5)+7 means it is a factor of 7.
[7*3*5+7 = 7*16=112]
hence it is a composit no.



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