A) \[\frac{n-5}{6}\]
B) \[\frac{n-4}{5}\]
C) \[\frac{5}{n-4}\]
D) \[\frac{6}{n-5}\]
Correct Answer: B
Solution :
\[^{n}{{C}_{4}}{{a}^{n-4}}{{(-b)}^{4}}{{+}^{n}}{{C}_{5}}{{a}^{n-5}}{{(-b)}^{5}}=0\] \[\Rightarrow \] \[^{n}{{C}_{4}}a{{-}^{n}}{{C}_{5}}.b=0\] \[\Rightarrow \] \[a/b=\frac{^{n}{{C}_{5}}}{^{n}{{C}_{4}}}=\frac{n-4}{5}\]
You need to login to perform this action.
You will be redirected in
3 sec
