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Khan Academy is an American non-profit educational organization created in 2006 by Sal Khan. Its goal is to create a set of online tools that help educate students. The organization produces short video lessons. Its website also includes... Wikipedia
Khan Academy is a nonprofit providing a free, world-class education for anyone, anywhere. Our interactive practice problems, articles, and videos help ...
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Study math, science, economics, finance, grammar, history, government, politics, and much, much more. - Sharpen your skills: Practice exercises, quizzes, and ...