nP4= 18.n-1P₂ find the value of n.
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Answer:
Given,
n
p
4
n−1
p
3
=
4
1
(n−4)!
n!
(n−1−3)!
(n−1)!
=
4
1
(n−4)!
n(n−1)!
(n−4)!
(n−1)!
=
4
1
n
1
=
4
1
n=4
Hence, this is the answer.
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