A) \[{}^{m\,-\,2n}{{C}_{n\,-1}}\]
B) \[{}^{m\,+\,n\,-\,3}{{C}_{m\,-1}}\]
C) \[\frac{1}{m!}\left[ {}^{m+n-1}{{P}_{m}}-{}^{n}{{P}_{m}} \right]\]
D) \[\frac{1}{m!}\left[ {}^{m\,+\,n\,-\,1}{{P}_{n\,-1}}-{}^{n}{{P}_{m}} \right]\]
Correct Answer: C
Solution :
Ways \[={}^{m\,+\,n\,-1}{{C}_{n\,-1}}-{}^{n}{{C}_{m}}\]
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