k1+k2+k3.....+kn-(k1^2+k2^2+k3^2.....+kn^2) How can i solve it!?
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Originally Posted by fra k1+k2+k3.....+kn-(k1^2+k2^2+k3^2.....+kn^2) How can i solve it!? There is no equation there. So nothing to solve. So what is to be done there?
simplify in some way
Originally Posted by fra simplify in some way Well it could be written as $\displaystyle \sum\limits_{j = 1}^n {{k_j}\left( {1 - {k_j}} \right)}$. Or there are many other possibilities.
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