[tex]2+4+6+...+100
\\ n=100/2
\\ n=50
\\ n×(n+1)
\\ 50×(50+1)
\\ 50×51
\\ 2550 \sqrt{2550 } = 50.49 \\ nu \: este \: patrat \: perfect.[/tex]
[tex]1 + 3 + 5 + ... + 99 \\ n = \frac{99 + 1}{2} \\ n = \frac{100}{2} \\ n = 50 \\ n = {50}^{2} \\ n = 2500 \\ este \: patrat \: perfect.[/tex]
