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In the expansion of (2x^(1/5)-1/(x^(1/5)...

In the expansion of `(2x^(1/5)-1/(x^(1/5)))^15` , coefficients of `x^-1` and `x^-3` are `m and n` respectively. If `m*n^2=.^15C_r*2^r`, then r is equal to _____

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