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In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...
Dr. Scholl's Time Off Sneaker. $70 $100 Save $30. People have called them "literally the comfiest sneaker" they've ever worn. For us, this taupe pair is tops. $70 at Amazon.
If your current bags have seen better travel days, it's time to level up with a truly incredible deal. The bestselling Travelhouse 3-piece luggage set is 70% off at Walmart, bringing it down to $90.
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.