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Question
. Find the sum of the following series [3 marks each]. \text { (a) } \sum_{n=1}^{\infty} 5 \cdot 3^{2 n} 2^{-4 n} \text { b) } \sum_{n=0}^{\infty} \frac{3^{n+1}(-5)^{1-n}}{2^{n}}
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