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Question

Explain why.7x11x13+13 and 7x6x5x4x3x2x1+5 are composite numbers.

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Solution

we have , 7*11*13+13=1001+13 =1014
1014 = 2*3*13*13
so, it's the product of more than two prime numbers
2,3 and 13
hence , it is a composite number
7*6*5*4*3*2*1+5=5040+5=5045
=> it is a product of prime factor 5 and 1009
hence, it is a composite number.

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