explain why 7×11×13+13 and 7×6×5×4×3×2+1+5 are composite number . solve it
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(i) 7×11×13+13
= 13(7×11×1+1)
= 13 ×78
= 13 × 2 × 13 × 3
Since it is a product of primes it is a composite number
(II)
7 ×6×5×6×3×2+1+5
5(7×3×2×1×3×2+1+1)
again since it is a product of primes it is a composite number
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