Question

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




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Answer 1

Answer: 7×11×13+13 may be written as, i.e. 13 * (78). So other than 1 and the number itself, 13 and 78 are also the factors of the number. ... Hence its composite number. Similarly, 7×6×5×4×3×2×1+5 can be written as , i.e. 5 * (1009).

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