Explain why \( 7 \times 11 \times 13+13 \) and \( 7 \times 6 \times 5 \times 4 \times 3 \times 2...

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Explain why \( 7 \times 11 \times 13+13 \) and \( 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1+5 \) are composite numbers.
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