Answers

2016-04-30T16:33:49+05:30
13 is common
13(7*11*1+1)
13*78
product of primes is composite num

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2016-04-30T17:00:24+05:30
(7 × 11 × 13) + 13
Can be written as

13[(7 × 11) + 1]
Or
13 × (77 + 1)
= 13 × 78

According,to the defination of composite numbers, they can be written as a product of any two numbers except one and itself.

So, the given expression is a composite number!
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