explain why 7*11*13+13 is a composite number

Asked by prgayathri | 21st Apr, 2008, 07:29: PM

Expert Answer:

 Fundamental them. of arithmetic  every composite number can be expressed as a product of primes.

 7x11x13 + 13 = 13 x ( 1 + 7 x11)

                           = 13 ( 7x11 + 1 )

                           = 13 x 78 which is a composite number     

                           

Answered by  | 8th May, 2008, 01:04: PM

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