The sum \( \sum_{\mathrm{k}=1}^{20}(1+2+3+\ldots \ldots .+\mathrm{k}) \) is [JEE Main 2020, 8 Jan (Shift 1)]
Q1
The sum \( \sum_{\mathrm{k}=1}^{20}(1+2+3+\ldots \ldots .+\mathrm{k}) \) is
[JEE Main 2020, 8 Jan (Shift 1)]
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