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What is the value of i=

What is the value of i=-example-1
User Yun Huang
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\sum\limits_(t=1)^3\left(4\cdot\left((1)/(2)\right)^(t-1)\right)=4\cdot\left((1)/(2)\right)^(1-1)+4\cdot\left((1)/(2)\right)^(2-1)+4\cdot\left((1)/(2)\right)^(3-1)\\\\=4\cdot\left((1)/(2)\right)^0+4\cdot\left((1)/(2)\right)^1+4\cdot\left((1)/(2)\right)^2=4\cdot1+4\cdot(1)/(2)+4\cdot(1)/(4)\\\\=4+2+1=7\\\\Answer:\ \boxed{D.\ 7}

User SatAj
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