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2. 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 ...

3. Barnes & Noble - Wikipedia

   en.wikipedia.org/wiki/Barnes_&_Noble

   Barnes & Noble Booksellers is an American bookseller with the largest number of retail outlets in the United States. The company operates approximately 600 retail stores across all 50 U.S. states.

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. B - Wikipedia

   en.wikipedia.org/wiki/B

   B, or b, is the second letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide.Its name in English is bee (pronounced / ˈ b iː /), plural bees.

6. N - Wikipedia

   en.wikipedia.org/wiki/N

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

7. 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 ...