Y by Adventure10, Mango247
Let
be a given positive integer. Show that we can choose numbers
(
) such that ![\[ 0\le\sum_{k=1}^nc_k\cdot k^2\le4.\]](//latex.artofproblemsolving.com/d/c/3/dc36099577de5e62ccf931ad09d98d739d784ad4.png)



![\[ 0\le\sum_{k=1}^nc_k\cdot k^2\le4.\]](http://latex.artofproblemsolving.com/d/c/3/dc36099577de5e62ccf931ad09d98d739d784ad4.png)
We have your learning goals covered with Spring and Summer courses available. Enroll today!
Something appears to not have loaded correctly.