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a) u_{n}=a_{1}(r)^{n-1}

u_{15}=4(0.6)^{15-1}

u_{15}=4(0.6)^{14} 



b) r is equal to 0.6

S_{\infty}=\frac{a{_1}}{1-r}

S_{\infty}= \frac{4}{1-0.6}

S_{\infty}= 10 is the answer

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