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If the coefficients of rth, (r+1)t h ,a ...

If the coefficients of rth, `(r+1)t h ,a n d(r+2)t h` terms in the expansion of `(1+x)^(14)` are in A.P., then `r` is/are a. 5 b. 11 c. `10` d. `9`

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