Question

If nP3= 120 then n:
(a) 8
(b) 4
(d) none of these
(c) 6​

Answer 1

Answer:

option (d)

________________

Answer 2

Explanation:

HERE IS UR ANSWER MATE:-

nP3= 120

(n)!

___= 120

(n-3)!

n×(n-1)×(n-2) × (n-3)!

________________=120

(n-3)!

n×(n-1) × (n-2) = 4×3×10 ...

BY COMPARING ,

n=4

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