If in the expansion of (1+x)^(15), the c...

If in the expansion of `(1+x)^(15),` the coefficients of `(r+3)^(t h)a n d\ (r-1)^(t h)` terms are equal then the value of `r` is a. 5 b. 6 c. 4 d. 3

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The correct Answer is:

`r=14`

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