Question

Find n


`\\ \rm\Rrightarrow {}^2nC_3:{}^nC_3=12:1`

Note:- It's C represents combination not Carbon.


Kindly don't add your irrelevant or unexplained answers if you are not sure .​

Answer 1

The value of
`n` is
`5`.

Step-by-step Step-by-step explanation:

`((2n - 1)(2n - 2))/(3 * 2 * 1) * (3 * 2 * 1)/(n(n - 1)(n - 2)) = (12)/(1)`

`= > 4(2n - 1) = 12(n - 2)`

`= > 2n - 1 = 3n - 6`

`= > 2n - 3n = - 6 + 1`

`= > - n = - 5`

Cancelling common negative sign,

`= > n = 5`