Explain why 7×11×13+13 and 7×6×5×4×3×2×1+5 are composite numbers.
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Answer:
in 1 when 13 is common then it have more than 2 factor
in same way when 5 is common it contain more than 2 Factor after multiplication
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1
7×11×13+13=13(7×11×1+1)
=13(77+1)
=13×78
7×6×5×4×3×2×1+5=5(7×6×1×4×3×2×1+1)
=5(1008+1)
=5×1009
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