4 find the value of the following sums of the terms of arithmetic sequ
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4. Find the value of the following sums of the terms of arithmetic sequences:(Show your work!) ^^20a)^^201+\frac{3}{2}+2+\frac{5}{2}+?+101 \begin{aligned} &\text { b) }\\ &\sum_{n=1}^{100}(4 n-3) \end{aligned}