Question

e 12 Find the value of n such that
"P. 5
(1) "Ps = 42 "P3, n>4
(i) Given that
(ii) np. 3.n>4​

Answer 1

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

Answer 2

Answer:

n = 11

Step-by-step explanation:

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