Answer
$\sum ^{33}_{i=1}3i$
Work Step by Step
$3+6+9+12+\ldots +99=3\times \left( 1\right) +3\times \left( 2\right) +3\times \left( 3\right) +3\times \left( 4\right) +\ldots +3\times \left( 33\right) =\sum ^{33}_{i=1}3i$
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