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If the coefficients of the (n+1)^(t h) t...

If the coefficients of the `(n+1)^(t h)` term and the `(n+3)^(t h)` term in the expansion of `(1+x)^(20)` are equal , then the value of `n` is a. `10` b. `8` c. `9` d. none of these

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