Math, asked by arulsnparulsnp, 2 months ago

15) If nPs = 42nP3, n>4 find n.​

Answers

Answered by malikrunal870
0

Step-by-step explanation:

n

P

5

=42n

P

3

(

(n−5)!

n!

)=42(

(n−3)!

n!

)

⇒(n−4)(n−5)=42

⇒n

2

−9n−22=0

⇒n=−2;11

As n should be positive and greater than 4

⇒n=11

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