Interest does not accrue during the period of the plan. * Financing available is “Equal payments, no interest” for 24 months (unless otherwise stated) and is only available on request, on approved credit and on purchases of $150 (unless otherwise stated) or more (Gift Cards excluded) made with your Triangle® Credit Cards at Canadian Tire, Sport Chek, Mark’s, L’Équipeur, Atmosphere, Pro Hockey Life, Party City, Sports Rousseau, Hockey Experts, L’Entrepôt du Hockey and participating Sports Experts stores. Then you’re counting integer solutions to $x_1+x_2+x_3=25$ that satisfy the conditions $0\le x_1\le 15$, $0\le x_2\le 20$, and $0\le x_3\le 25$.**Online prices and sale effective dates may differ from those in-store and may vary by region. Let $x_1,x_2$, and $x_3$ by the number of red, blue, and green balls, respectively, that you select. $$Īdded: Here’s another way to look at it that may be more familiar to you. If there were no upper limits, the answer would be $\binom2-\binom62=351-55-15=281\. Your problem is equivalent to asking how many different ways there are to distribute your $25$ balls amongst the boxes, if you can put at most $15$ balls into the RED box and at most $20$ balls into the BLUE box. Imagine that you have $25$ identical balls and three boxes, one labelled RED, one labelled BLUE, and one labelled GREEN.
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