explain why 7*11*13+13and7*6*5*4*3*2*1+5 are compostive number
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Answer:
Composite numbers are product of prime numbers.
Step-by-step explanation:
7×11×13+13
= 13(7×11×1+1) ...removing 13 common
= 13(77+1)
= 13×78
= 13×13×2×3
Since this expression is product of prime numbers, it is a composite number.
7×6×5×4×3×2×1+5
= 5(7×6×1×4×3×2×1+1) ...removing 5 common
= 5(1008+1)
= 5×1009
Since this expression is product of prime numbers, it is a composite number.
Hope it helps
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