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Find the sum to indicated number of terms in each of the geometric progressions in x cube x raised to 5 x raised to 7 n terms

10.  Find the sum to indicated number of terms in each of the geometric progressions in 

         x ^3 , x^5 , x^7 ... n \: \: terms (if \: \: x \neq \pm 1)

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GP=x ^3 , x^5 , x^7 .....................

 a=x^3\, \, \, and\, \, r=\frac{x^5}{x^3}=x^2

S_n=\frac{a(1-r^n)}{1-r}

S_n=\frac{x^3(1-(x^2)^n)}{1-x^2}

S_n=\frac{x^3(1-x^2^n)}{1-x^2}

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