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Dat Do edited beginproblem_a_You_a.tex
about 10 years ago
Commit id: 5f258386a04ff0186c1b3df076b7328ded370245
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\end{problem}
\textbf{Solution 1: }
Since we are receiving one extra coupon for each consecutive day, the total coupons received for $n$ days can be represented as
$\sum\limits_{i=1^n} $\sum\limits_{i=1}^n i$