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Logic as follows: At first, you will get a unique coupon so the exp value of getting 1 unique coupon is 1.
Next, every 5 out of 6 boxes will get you a unique coupon.
The expected value of boxes you need to open to get the 2nd unique coupon once you already have a coupon is 1/p where p is the probability of getting a new coupon.
Plus, act now and you'll get a "unique coupon code for a free calendar from Shutterfly a $19.99 value"!
Sproose also offers unique coupon and discount codes.
Many times, a store might base a unique coupon off the bar code numbers or the wording if it says "Manufacturer" or "Store" on it.
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And so on and so forth until you arrive at the desired number of unique coupons.
For 3 unique coupons, the expected value would be 1 + 6/5 + 6/4 = 3.7.
Coupons had unique identification numbers linking coupons to the referring seed.
Respondent data from the RDS study was deposited into a STATA (StataCorp, College Station, TX) database, including the unique identifiers of coupons issued to respondents, as well as the identifier of the coupon with which they were referred.
Under cathodic protection, the active area increases and the residual corrosion rates tend to a unique value for all coupons.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com