Explain why 7×6×5×4×3×2×1+5 is a composite number.

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Solution

7×6×5×4×3×2×1+5=5(7×6×4×3×2×1+1)
=5(1008+1)=5×1009
It means that 5 and 1009 are factors of (7×6×5×4×3×2×1+5).
Hence, (7×6×5×4×3×2×1+5) is composite number.

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7 \times 11 \times 13 + 13

7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 + 5

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

Explain why $7 \times 11 \times 13 + 13$ & $7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 + 5$ are composite numbers ?

7 \times 11 \times 13 + 13

7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 + 5

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