Question

Find the sum of all positive multiples of 3 less than 50

Answer 1

$3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 \\ + 27 + 30 + 33 + 36 + 39 + 42 + 45 \\ + 48 \\ \\ \\ \\ = 408$

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