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

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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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