this is for holding javascript data
Dat Do edited beginproblem_a_You_a.tex
about 10 years ago
Commit id: 67e432e85f8192605ef8c2b61a45ab9221247c08
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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
$\sumi$ $\sum i$