Question

if c(2n,3) : C(n,3) = 11:1 find n

Answer 1

2nc3=11nc3

> 2n(2n-1)(2n-2)=11n(n-1)(n-2) ( in this 3 factorial will cancel out both side)

>4n(n-1)(2n-1)=11(n-1)(n-2)

>4(2n-1)=11(n-2)

>8n-4=11n-22

>3n=18

>n=6

Answer 2

Answer:

Your answer is 6

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