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2. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Organized coupon exchange clubs are commonly found in regions where coupons are distributed. Often coupons are available for purchase at some online sites, [26] but since most coupons are not allowed to be sold, the fee is considered to be for the time and effort put into cutting out the coupons. Some types of coupons may be sold.

3. Barnes & Noble - Wikipedia

   en.wikipedia.org/wiki/Barnes_&_Noble

   Noble died on June 6, 1936, at the age of 72. [20] In 1932, at the height of the Great Depression, the bookstore moved its flagship location to 18th Street and Fifth Avenue, [21] which served as the company's flagship location until its closure in 2014. The Noble family retained ownership of an associated publishing business, and Barnes & Noble ...

4. Signal-to-noise ratio - Wikipedia

   en.wikipedia.org/wiki/Signal-to-noise_ratio

   The OSNR is the ratio between the signal power and the noise power in a given bandwidth. Most commonly a reference bandwidth of 0.1 nm is used. This bandwidth is independent of the modulation format, the frequency and the receiver. For instance an OSNR of 20 dB/0.1 nm could be given, even the signal of 40 GBit DPSK would not fit in this bandwidth.

5. Binomial coefficient - Wikipedia

   en.wikipedia.org/wiki/Binomial_coefficient

   For instance, by looking at row number 5 of the triangle, one can quickly read off that ... 20: 151–162. Archived from the original on 2015-09-23

6. Binomial theorem - Wikipedia

   en.wikipedia.org/wiki/Binomial_theorem

   In elementary algebra, the binomial theorem (or binomial expansion) describes the algebraic expansion of powers of a binomial.According to the theorem, the power ⁠ (+) ⁠ expands into a polynomial with terms of the form ⁠ ⁠, where the exponents ⁠ ⁠ and ⁠ ⁠ are nonnegative integers satisfying ⁠ + = ⁠ and the coefficient ⁠ ⁠ of each term is a specific positive integer ...

7. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   Nicolas Chuquet used the term progression naturelle (natural progression) in 1484. [20] The earliest known use of "natural number" as a complete English phrase is in 1763. [21] [22] The 1771 Encyclopaedia Britannica defines natural numbers in the logarithm article. [22] Starting at 0 or 1 has long been a matter of definition.