Explain why 7×11×13 and 7×6×5×4×3×2×1+5 are composite number?

1.	Explain why 7×11×13 and 7×6×5×4×3×2×1+5 are composite number?
Answer» Given\xa07×11×13+13=13×(7×11+1)=3×78\xa0This number is multiple of two integers. Hence it has more than two factors. Hence it is a composite number.similarly in7×6×5×4×3\xa0×2×1+5 =5(7×6×4×3\xa0×2×1+1)=5×1009 This number is multiple of two integers.Hence it has more than two factors.Hence it is a composite number.

Discussion