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b) Write out the sum of the first four nonzero terms of the series representing this function.

c) Determine the interval of convergence. The outside boxes require the endpoints and the inside boxes require the symbol < or <=.

I already got a.) which is sum from n=0 to infinity [ (-1)^n *(x/sqrt(6))^(2n+1) ] / (2n+1)

I think I got b.) not too sure if this one is right but i got (x/sqrt(6))-(x^3/(3*6^(3/2)))+(x^5/(5*6^(5/2)))-(x^7/(7*6^(7/2))).

And so I just need someone to check b for me and I dont even know what to do for the interval of convergence.