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Can I get some help solving this problem? Thanks!

1 Answer

Mar 19, 2018

See below.

Explanation:

Calling #S_n = sum_(k=1)^n (a k^2+b k + c) = a(n(n+1)(2n+1))/6+b(n(n+1))/2+n c#

we need

#S_5#

so you get the result making

#a = 0.17, b = -1.02, c= 6.67, n=5#

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