Find the series, then we'll talk

Algebra Level 4

\[ (1\times 1) +( 2\times 3) + (3\times 6) + (4\times 10) + (5\times 15) + (6\times 21) +\ldots \]

Find the sum to 50 terms of the summation above.

×

Problem Loading...

Note Loading...

Set Loading...