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## Answers

13 is common

13(7*11*1+1)

13*78

product of primes is composite num

13(7*11*1+1)

13*78

product of primes is composite num

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!