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| = Textbook = | | = Textbook = |
− | NCERT text book on permutations and combinations [http://www.ncert.nic.in/NCERTS/l/kemh107.pdf click here]
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− | Gujarat state text book on permutations and combinations [http://gujarat-education.gov.in/textbook/Images/11sem1/maths11-eng/chap7.pdf click here]
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| =Additional Information= | | =Additional Information= |