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If m is the coefficient of 7th term and ...

If m is the coefficient of 7th term and n is the coefficient of 13th therm in expansion of `(x^(2/3)/3+1/(2x^(1/3)))^18` then value of `(x^(2/3)/3+1/(2x^(1/3)))^18` is

A

`1/4`

B

`1/9`

C

`4/9`

D

`9/4`

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