Gujarati
6.Permutation and Combination
easy

If $2 \times {}^n{C_5} = 9\,\, \times \,\,{}^{n - 2}{C_5}$, then the value of $n$ will be

A

$7$

B

$10$

C

$9$

D

$5$

Solution

(b) By inspection $n = 10$.

Standard 11
Mathematics

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.