Question: Write the following sums as series in sigma notation where the index of summations starts with k = 1. 1. 2+6+12+20+30+42+56+72+90 2. 1/4-1/9+1/16-1/25+1/36-1/49+1/64 3. x+x^2/2+x^3/6+x^4/24+x^5/120+x^6/720+x^7/5040

Write the following sums as series in sigma notation where the index of summations starts with k = 1. 1. 2+6+12+20+30+42+56+72+90 2. 1/4-1/9+1/16-1/25+1/36-1/49+1/64 3. x+x^2/2+x^3/6+x^4/24+x^5/120+x^6/720+x^7/5040

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