The sum \( \sum_{k=1}^{20}(1+2+3+\ldots . .+k)= \)
\( \mathrm{P} \)...
The sum \( \sum_{k=1}^{20}(1+2+3+\ldots . .+k)= \)
\( \mathrm{P} \)
W
(1) 1540
(2) 4015
(3) 1680
(4) 1640
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