Question

Explain why 7×6×5×4×3×2×1 +5 and 7×11 ×13 +13 are composite numbers please solve it
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Answer 1

Answer:

first number when 5 taken common become 5(7×6×4×3×2+1) and second number when 13 is

taken common become 13(7× 11+1) .

Therefore, first and second number respectively are 5 × 1009 and 13 × 78 so clearly they are composite numbers