Need some help regarding Summation Notation

[Tiger_shark]

I need help with the following question...

Express the following sum in summation notation. Only one summation notation should be used and the final expression should be factorized as much as possible.

A = (-1/J) + [((K^2)/120)(20 - (K^2)J)]

I have no idea whether or not this involves a double summation, or whether one of the variables is a dummy, nor do I know whether or not it is relevant -_-. I have no clue as to how to start this problem...

Thanks in advance

 

[stapel]

Express the following sum in summation notation.

A = (-1/J) + [((K^2)/120)(20 - (K^2)J)]

I'm sorry, but I don't see how one could use summation notation for this, other than trivially (that is, with just the one given term). I don't see any indication that either of the variables is a counter, or that anything infinity (or at least large, for more than one value of K or J) is going on.

Please reply with clarification. Thank you!

Eliz.