Find n if the given value of x is the ...

Find `n` if the given value of `x` is the `n t h` term of the given A.P. `(i)5 1/2,\ 11 ,\ 16 1/2,\ 22 ,\ dot;\ \ x=550` (ii) `1,(21)/(11),(31)/(11),(41)/(11),\ ddot,\ \ \ x=(171)/(11)`

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