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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    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 ...

  3. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. [6] Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to potential customers and placed in magazines ...

  4. Middle gray - Wikipedia

    en.wikipedia.org/wiki/Middle_gray

    Middle gray. 50% CIELAB lightness. ( Y = 18.4%) In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light. [2] [3]

  5. What did Alicent and Rhaenyra just plan? ‘House of the Dragon ...

    www.aol.com/news/did-alicent-rhaenyra-just-plan...

    Rhaenyra is less persuaded by this dream of freedom. She knows her part; it was decided for her (echoing Daemon’s own revelations earlier on in the episode). The plan is set. In three days time ...

  6. Illinois - Wikipedia

    en.wikipedia.org/wiki/Illinois

    Illinois ( / ˌɪlɪˈnɔɪ / ⓘ IL-in-OY) is a state in the Midwestern region of the United States. It borders Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash and Ohio rivers to its south.

  7. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    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.