Question

If np7=43.np5 find n

Answer 1

np7=42.np5

n(n-1)(n-2)(n-3)(n-4)(n-5)(n-6)=42.n(n-1)(n-2)(n-3)(n-4)

(n-5)(n-6)=42

(n-5)(n-6)=7×6

(n-5)=7

n=12

Answer 2

Step-by-step explanation:

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