Question 887613
Express the given sums using sigma notation for the following:
 a) 2+6+10+14+18:::: SUM[2+(n-1)4] from n = 1 to n = 4
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 b) 5+25+125+625:::: SUM[5^n] from n = 1 to n = 4
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 c) 1/2+1/2×3+1/3×4+...+1/99×100::: 
SUM[(1/2) + (1/n)*(n+1)] from n = 1 to n = 99
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Cheers,
Stan H.
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