Question

Explain why 7* 11 * 13 + 13 and 7 *6*5*4*3 2 * 1 +5 are composite numbers.
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Answer 1

Step-by-step explanation:

The above two numbers are composite numbers.

Since 7*11*13+13 is again a multiple of 13. so the number has more than three factors as 1, itself and 13.

Also 7*6*5*4*3*1+15 is a composite number since it has more than 3 factors.