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a) Divide the 2 consecutive numbers in order to find the ratio 

\frac{-50}{100}=-0.5



b) u_{n}=a_{1}(r)^{n-1} is the formula

u_{7}=100(-0.5)^{6}

u_{7}= 1.5625



c) \sum=\frac{a_{1}}{1-r}

\sum=\frac{100}{1.5}

\sum=66.66666

Explanation

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