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  2. Clipper card - Wikipedia

    en.wikipedia.org/wiki/Clipper_card

    Obtaining a card was free from introduction in June 2010 to encourage users to adopt the card, until September 1, 2012, when new adult cards began to cost $3. [37] This charge covers the cost (approximately $2) to manufacture each card, helps cover operating expenses, [38] and reduces the incentive to throw away the card if the value goes negative when fare is calculated on exit. [39]

  3. Coupon (finance) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(finance)

    Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. [2] For example, if a bond has a face value of $1,000 and a coupon rate of 5%, then it pays total coupons of $50 per year.

  4. Credit card - Wikipedia

    en.wikipedia.org/wiki/Credit_card

    Second, an additional 3 or 4 digit card security code (CSC) or card verification value (CVV) is now present on the back of most cards, for use in card not present transactions. Stakeholders at all levels in electronic payment have recognized the need to develop consistent global standards for security that account for and integrate both current ...

  5. Sildenafil - Wikipedia

    en.wikipedia.org/wiki/Sildenafil

    Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4] [8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9]

  6. Card counting - Wikipedia

    en.wikipedia.org/wiki/Card_counting

    The primary goal of a card counting system is to assign point values to each card that roughly correlate to the card's "effect of removal" or EOR (that is, the effect a single card has on the house advantage once removed from play), thus enabling the player to gauge the house advantage based on the composition of cards still to be dealt.

  7. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.