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2. 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.

3. Zero-coupon bond - Wikipedia

   en.wikipedia.org/wiki/Zero-coupon_bond

   Zero coupon bonds have a duration equal to the bond's time to maturity, which makes them sensitive to any changes in the interest rates. Investment banks or dealers may separate coupons from the principal of coupon bonds, which is known as the residue, so that different investors may receive the principal and each of the coupon payments.

4. International reply coupon - Wikipedia

   en.wikipedia.org/wiki/International_reply_coupon

   An international reply coupon (IRC) is a coupon that can be exchanged for one or more postage stamps representing the minimum postage for an unregistered priority airmail letter sent to another Universal Postal Union (UPU) member country.

5. Promo (media) - Wikipedia

   en.wikipedia.org/wiki/Promo_(media)

   A promo (a shorthand term for promotion) is a form of commercial advertising used in broadcast media, either television or radio, which promotes a program airing on a ...

6. Discount - Wikipedia

   en.wikipedia.org/wiki/Discount

   Discounts and allowances, reductions in the basic prices of goods or services; Discounting, a financial mechanism in which a debtor obtains the right to delay payments to a creditor; Delay discounting, the decrease in perceived value of receiving a good at a later date compared with receiving it at an earlier date; Discount store

7. Student council - Wikipedia

   en.wikipedia.org/wiki/Student_council

   A student council (also known as a student union, associated student body or student parliament) is an administrative organization of students in different educational institutes ranging from elementary schools to universities and research organizations around the world.