Question

if nP3=12 nrP3 then find n​

Answer 1

It's Pratik Dada Khedkar

Answer 2

Answer:

Solution

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Correct option is

A

15

16

n

P

3

=13

n+1

P

3

⇒

(n−3)!

16n!

=

(n−2)!

13(n+1)!

⇒16=

n−2

13(n+1)

⇒16n−32=13n+13

⇒3n=45

⇒n=15