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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_Code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

3. Coin problem - Wikipedia

   en.wikipedia.org/wiki/Coin_problem

   For example, the largest amount that cannot be obtained using only coins of 3 and 5 units is 7 units. The solution to this problem for a given set of coin denominations is called the Frobenius number of the set. The Frobenius number exists as long as the set of coin denominations is setwise coprime.

4. Change-making problem - Wikipedia

   en.wikipedia.org/wiki/Change-making_problem

   Change-making problem. The change-making problem addresses the question of finding the minimum number of coins (of certain denominations) that add up to a given amount of money. It is a special case of the integer knapsack problem, and has applications wider than just currency. It is also the most common variation of the coin change problem, a ...

5. Application Code for E-Ticket? - Punta Cana Forum - Tripadvisor

   www.tripadvisor.com/ShowTopic-g147293-i28-k...

   There's no payment, it is free as long as you're in the correct site. You shouldn't need a copy or even the QR as it's linked to your passport number. Personally I print it (bit of a dinosaur). There's a different application code on the return E-ticket, not one I recall being stuck in my face for noting when I did that 2nd stage of applying.

6. List of cryptocurrencies - Wikipedia

   en.wikipedia.org/wiki/List_of_cryptocurrencies

   Ethash [ 76] KodakCoin is a "photographer-centric" blockchain cryptocurrency used for payments for licensing photographs. Petro. Venezuelan Government. onixCoin [ 77] C++ [ 78] Stated by Nicolás Maduro to be backed by Venezuela 's reserves of oil. As of August 2018.

7. Gateway QR code form to enter Jordan - Jordan Forum

   www.tripadvisor.com/ShowTopic-g293985-i2131-k...

   Aristotlenova, that is good to know. My last flight to Jordan was last month and I had to show a QR code at check-in. Even though you did not need to show the QR code, the Jordanian government has your information by the fact you applied (it's possible they verified it with the airline before you showed up at the airport). Regardless, I still ...