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The value of sum(r=0)^(n-1) (""^nCr)/(""...

The value of `sum_(r=0)^(n-1) (""^nC_r)/(""^nC_r+ ""^n C_(r+1))` equals
a. `n+1`
b. `n/2`
c. `n+2`
d. none of these

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