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Explain why 3 × 5 × 7 + 7 is a composite number.

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+2 votes
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asked Apr 12, 2017 in Mathematics by Annu Priya (18,055 points) ● 24 ● 45 ● 82

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answered Apr 12, 2017 by vikash (21,277 points) ● 4 ● 19 ● 70
 
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Solution:
3 × 5 × 7 + 7 = (3 × 5 + 1) × 7
= (15 + 1) × 7
= 16 × 7 = 7 × 16
Since (3 × 5 × 7 + 7) can be expressed as a
product of primes, it is a composite number.

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Explain why 3 x 5 x 7+7 is a composite number.
asked Jan 29, 2018 in Mathematics by sforrest072 (157,439 points)

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