Let $P =\sum_{\substack{1\le i \le 2k \\ i\;odd}} i$ and $Q = \sum_{\substack{1 \le i \le 2k \\ i\;even}} i$, where $k$ is a positive integer. Then
Nice approach.Thanks :-)
Just small correction needed."The odd series is 2 4 6 8 10 ... 2k ."
Gatecse