sho77
sho77
08-07-2020
Mathematics
contestada
A – If P(n,4) = 20 × P(n,2), determine the value of n.
Respuesta :
mani82ebra
mani82ebra
08-07-2020
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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