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$discrete mathematics - How did $-(2^{k-1})-(2^{k-2}) -\\dotsb-(2^0 ...$

$Solved: The series * (2 Points) sumlimits _(k=1)^(∈fty)frac 2^(k-1)(k+1 ...$

$calculus - First four terms of $ \\sum_{k=1}^\\infty \\frac{(-1)^{k+1(2^k ...$