Question

31. If ^np5 = 42^np3, n>4. Find n.​

Answer 1

Answer:

answer

Step-by-step explanation:

n P 5 =42n P 3( (n−5)!n! )=42( (n−3)!n! )

⇒(n−4)(n−5)=42

⇒n2

−9n−22=0

⇒n=−2;11

As n should be positive and greater than 4

⇒n=11

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