deletions | additions       diff --git a/beginproblem_a_You_a.tex b/beginproblem_a_You_a.tex  index 8b60cba..cac4326 100644  --- a/beginproblem_a_You_a.tex  +++ b/beginproblem_a_You_a.tex 
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\noindent  (b) Since we are still receiving one extra coupon for each consecutive day, $\sum\limits_{i=1}^k i$ can still represent the number of coupons received. However, the value of the coupons is: $1 + 2 + 4 + 8 + \ldots + 2{n-1}$ which can be represented as $\sum\limits_{i=1}^n 2^{n-i}$.   \smallskip  We must multiply the quantity and the value together to get the total value resulting in: $W_n) $W(n)  = \sum\limits_{i=1}^n i*2^{n-i}$