Summation Evaluate these summations. a) N(E)k=1 (k-k^3) b) N-1(E)k=1 (k^2/N^2) Note that (E) is the summation symbol. Not sure how to do these. Help would be appreciated

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Summation Evaluate these summations. a) N(E)k=1 (k-k^3) b) N-1(E)k=1 (k^2/N^2) Note that (E) is the summation symbol. Not sure how to do these. Help would be appreciated

Mathematics
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hey m not sure i understand..r the terms on the right the expression for the kth term??
do we have to evaluate the sum of the series whose term is k-k^3????clarify and i cn help
sorry it's all squashed together, didn't notice! there are two questions: a) N (E) k=1 (k-k^3) b) N-1 (E) k=1 (k^2/N^2) where N = natural numbers and (E) is the summation symbol The N and N-1 for the questions are on top of the summation symbol and the k =1 are below the symbol. The (k-k^3) and (k^2/N^2) are on the right sides of the summation symbol.

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u can use the equation tab to write it in mathematical format
ugghh it keeps squashing together - but a) and b) are separate questions
N(N+1)/2 + [N(N+1)/2]^2
thats a)
as for b) (N-1)(N)(2N-1)/6N ^2
\[\sum_{k=1}^{N}(k-k^3)\]
yes uzma that's the correct format for a)
and b?????
\[\sum_{k}^{N-1}(k^2/N^2)\]
i gave d answers
Yes that's the correct one for b) him1618, thanks for your help :) and uzma too :)
no prob
did u understand the solution?
Yes, thank you :)
welcome:)
wht tym is it there at ur place?
9:02pm
where r u?
new zealand
k...
N(E)K=1(K-K^3) (E)1/1-K^2=1/N N=1-K^2 K=1 N=0
what sort of followup is this kihaga???
Yes! that is Honorata kihaga

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