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  2. Doubtnut - Wikipedia

    en.wikipedia.org/wiki/Doubtnut

    The platform uses image recognition technologies to provide answers and explanation of mathematical and science questions of highschool to college level. [1] [5] To find the solution to a question, one has to upload an image depicting the question.

  3. Inquiry - Wikipedia

    en.wikipedia.org/wiki/Inquiry

    A question mark. An inquiry (also spelled as enquiry in British English) [a] [b] is any process that has the aim of augmenting knowledge, resolving doubt, or solving a problem.A theory of inquiry is an account of the various types of inquiry and a treatment of the ways that each type of inquiry achieves its aim.

  4. Project Euler - Wikipedia

    en.wikipedia.org/wiki/Project_Euler

    Special awards exist for solving special combinations of problems. For instance, there is an award for solving fifty prime numbered problems. A special "Eulerians" level exists to track achievement based on the fastest fifty solvers of recent problems so that newer members can compete without solving older problems.

  5. Inquiry (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Inquiry_(disambiguation)

    Inquiry, also spelt enquiry, is any process that has the aim of augmenting knowledge, resolving doubt, or solving a problem. The Inquiry was a study group to prepare materials for the peace negotiations following World War I. Enquiry, inquiry, or The Inquiry may also refer to:

  6. List of Internet forums - Wikipedia

    en.wikipedia.org/wiki/List_of_Internet_forums

    An Internet forum, or message board, is an online discussion site where people can hold conversations in the form of posted messages. [1] They are an element of social media technologies which take on many different forms including blogs, business networks, enterprise social networks, forums, microblogs, photo sharing, products/services review, social bookmarking, social gaming, social ...

  7. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    It is impossible to solve in half of the starting positions. [1] Five room puzzle – Cross each wall of a diagram exactly once with a continuous line. [2] MU puzzle – Transform the string MI to MU according to a set of rules. [3] Mutilated chessboard problem – Place 31 dominoes of size 2×1 on a chessboard with two opposite corners removed ...

  8. Comparison of Q&A sites - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_Q&A_sites

    Contributions owned by the author. Quora granted "worldwide, non-exclusive, royalty-free license" to content use, distribution, or modification. [9] Yes, except to view single answers Free Reddit: 2005 — All topics: Depends on subreddit: No to browse, yes to contribute Sharecare: 2009 — Health and wellness: English: No Spring.me (formerly ...

  9. Wikipedia:List of free online resources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:List_of_free...

    The following list is meant to help you with your own research, by offering links to respectable information sources on the web, available free of charge. Inclusion on the list doesn't automatically mean the absolute truth is on these websites, so always be critical and compare information between different sources.