Is there formula for getting f(k) if I know F(n) in this equation:

sum_(k=1, to n) f(k) = F(n)

for example:

sum_(k=1, to n) f(k) = n^3

f(k)=?

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- Jun 30th 2012, 01:50 AMEmilijosum operator
Is there formula for getting f(k) if I know F(n) in this equation:

sum_(k=1, to n) f(k) = F(n)

for example:

sum_(k=1, to n) f(k) = n^3

f(k)=? - Jun 30th 2012, 02:27 AMgirdavRe: sum operator
What is $\displaystyle F(n)-F(n-1)$?