3 years ago

A – If P(n,4) = 20 × P(n,2), determine the value of n.

Mathematics

1 answer:

Kaylis [27]3 years ago

4 0

Answer:

P(n,4)÷P(n,2)

= (n-2)(n-3)

20 = 4 × 5 (two consecutive numbers)

(n-2)(n-3)=5×4

n-2=5

n=7

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