What's the sum of the first 100 positive integers? How about the first 1000? Learn the fun and fast way to solve problems like this. See more

Evaluate

\[ 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19. \]

\[ \begin{array} { l l l }

2 & = 2 & = 1 \times 2 \\
2 + 4 & = 6 & = 2 \times 3 \\
2 + 4 + 6 & = 12 & = 3 \times 4 \\
\vdots & \vdots & \vdots \\
\end{array} \]

According to the above pattern, what is

\[ 2 + 4 + 6 + \ldots + 30 ? \]

×

Problem Loading...

Note Loading...

Set Loading...