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  2. QTI - Wikipedia

    en.wikipedia.org/wiki/QTI

    But because Version 2.0 did not address test-level issues and was not compatible with Version 1, and because 2.1 was still under development, adoption of Version 2 was retarded. This was compounded in 2009 when IMS GLC withdrew the Version 2.1 draft and advised the user community that the only version "fully endorsed" by IMS GLC was 1.2.1, in ...

  3. Good 4 U - Wikipedia

    en.wikipedia.org/wiki/Good_4_U

    Good 4 U. " Good 4 U " (stylized in all lowercase) is a song by American singer-songwriter Olivia Rodrigo. It was released on May 14, 2021, through Geffen and Interscope Records, as the third single from Rodrigo's debut studio album, Sour (2021). The song was written by Rodrigo and its producer Dan Nigro who co-produced it with Alexander 23 .

  4. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    1/2 + 1/4 + 1/8 + 1/16 + ⋯. First six summands drawn as portions of a square. The geometric series on the real line. In mathematics, the infinite series ⁠ 1 2 ⁠ + ⁠ 1 4 ⁠ + ⁠ 1 8 ⁠ + ⁠ 1 16 ⁠ + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation ...

  5. 1/4 + 1/16 + 1/64 + 1/256 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/4_%2B_1/16_%2B_1/64_%2B...

    1/4 + 1/16 + 1/64 + 1/256 + ⋯. Archimedes' figure with a = ⁠ 3 4 ⁠. In mathematics, the infinite series ⁠ 1 4 ⁠ + ⁠ 1 16 ⁠ + ⁠ 1 64 ⁠ + ⁠ 1 256 ⁠ + ⋯ is an example of one of the first infinite series to be summed in the history of mathematics; it was used by Archimedes circa 250–200 BC. [1] As it is a geometric series ...

  6. 4-Phenyl-1,2,4-triazole-3,5-dione - Wikipedia

    en.wikipedia.org/wiki/4-Phenyl-1,2,4-triazole-3...

    Infobox references. 4-Phenyl-1,2,4-triazoline-3,5-dione (PTAD) is an azodicarbonyl compound. PTAD is one of the strongest dienophiles and reacts rapidly with dienes in Diels-Alder reactions. [ 1] The most prominent use of PTAD was the first synthesis of prismane in 1973. [ 2]

  7. 1 + 2 + 3 + 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The partial sums of the series 1 + 2 + 3 + 4 + 5 + 6 + ⋯ are 1, 3, 6, 10, 15, etc.The nth partial sum is given by a simple formula: = = (+). This equation was known ...

  8. 1,2,4-Butanetriol trinitrate - Wikipedia

    en.wikipedia.org/wiki/1,2,4-Butanetriol_trinitrate

    Infobox references. 1,2,4-Butanetriol trinitrate ( BTTN ), also called butanetriol trinitrate, is an important military propellant. It is a colorless to brown explosive liquid. [ 1] BTTN is used as a propellant in virtually all single-stage missiles used by the United States, including the Hellfire. [ 2] It is less volatile, less sensitive to ...

  9. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.