Question

if npn =720 then find n​

Answer 1

Answer:

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Answer 2

Answer:

n

P

r

=r!n

C

r

⇒

n

C

r

n

P

r

=r!⇒

120

720

=r!

⇒r=3

Now, n

P

3

=720

⇒n(n−1)(n−2)=720=10×9×8

⇒n=10

Step-by-step explanation:

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