A) \[\frac{{{2}^{n}}}{m+1}-\frac{n}{m+1}l(m+1,\,n-1)\]
B) \[\frac{n}{m+1}l(m+1,\,n-1)\]
C) \[\frac{{{2}^{n}}}{m+1}+\frac{n}{m+1}l(m+1,\,n-1)\]
D) \[\frac{m}{n+1}l(m+1,\,n-1)\]
Correct Answer: A
Solution :
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