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1+1/3x+(1xx4)/(3xx6)x^2+(1xx4xx7)/(3xx6x...

`1+1/3x+(1xx4)/(3xx6)x^2+(1xx4xx7)/(3xx6xx9)x^3+`------ is equal to a. `x` b. `(1+x)^(1//3)` c. `(1-x)^(1//3)` d. `(1-x)^(-1//3)`

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