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  2. Stepwell - Wikipedia

    en.wikipedia.org/wiki/Stepwell

    The Rani ki Vav, Patan, Gujarat. A multi-storey stepwell in Mahimapur Village, Amravati District, Maharashtra. Stepwells (also known as vavs or baori) are wells, cisterns or ponds with a long corridor of steps that descend to the water level. Stepwells played a significant role in defining subterranean architecture in western India from the 7th ...

  3. 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 ...

  4. Chand Baori - Wikipedia

    en.wikipedia.org/wiki/Chand_Baori

    Construction started. c. 800. Completed. c. 900 ; 1124 years ago. Chand Baori is a stepwell situated in the village of Abhaneri in the Indian state of Rajasthan. [ 1 ][ 2 ][ 3 ] It extends approximately 30 m (100 ft) into the ground, making it one of the deepest and largest stepwells in India. [ 4 ] It is named after a local ruler of Nikumbh ...

  5. Test of English as a Foreign Language - Wikipedia

    en.wikipedia.org/wiki/Test_of_English_as_a...

    The test is divided into 3 sections: reading and listening – step 1, reading and listening – step 2, and speaking. Depending on the fluency of students' English, they will be expected to take either the step 1 or step 2 test. Students are expected to take two of the three sections, depending on their communicative skills in English.

  6. International English Language Testing System - Wikipedia

    en.wikipedia.org/wiki/International_English...

    Website. ielts .org. International English Language Testing System ( IELTS / ˈaɪ.ɛlts /) [ 6] is an international standardized test of English language proficiency for non-native English language speakers. It is jointly managed by the British Council, IDP and Cambridge English, [ 6] and was established in 1989.

  7. Cambridge Assessment English - Wikipedia

    en.wikipedia.org/wiki/Cambridge_Assessment_English

    Cambridge Assessment English or Cambridge English develops and produces Cambridge English Qualifications and the International English Language Testing System ().The organisation contributed to the development of the Common European Framework of Reference for Languages (CEFR), the standard used around the world to benchmark language skills, [2] and its qualifications and tests are aligned with ...

  8. 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 ...

  9. 1,2,3,4-Tetraphenylnaphthalene - Wikipedia

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

    Infobox references. 1,2,3,4-Tetraphenylnaphthalene is a polycyclic aromatic hydrocarbon commonly prepared in the undergraduate teaching laboratory as an introduction to the Diels-Alder reaction, in this case between benzyne, which acts as the dienophile, (generated in situ) and tetraphenylcyclopentadienone, which acts as the diene. [3]