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  2. Simple Group of order 60 must be A5

    Simple Group of order 60 must be A5

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  3. Probability question: A group of n archers shoot at a target

    Probability question: A group of n archers shoot at a target

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  4. Volume of sphere, Cone, Pyramid

    Volume of sphere, Cone, Pyramid

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  7. There exist distinct integers x,y,z for which, x^2+y^2+z^2=14^n

    There exist distinct integers x,y,z for which, x^2+y^2+z^2=14^n

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  9. sum of the reciprocals of the primes is divergent

    sum of the reciprocals of the primes is divergent

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  10. Probability question chess tournament

    Probability question chess tournament

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  12. Hermitian matrix is diagonalizable and orthonormal basis

    Hermitian matrix is diagonalizable and orthonormal basis

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  13. Show e really exists in one page

    Show e really exists in one page

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  14. Google Interview 25 Horses 5 track

    Google Interview 25 Horses 5 track

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  15. Complex contour: Integral of ln(x)/(x^2+1) and ln(x)^2/(x^2+1)

    Complex contour: Integral of ln(x)/(x^2+1) and ln(x)^2/(x^2+1)

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  16. Learn ARM Assembly Lesson 3 - Labels, Branch CMP

    Learn ARM Assembly Lesson 3 - Labels, Branch CMP

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  18. Prove Method of infinite Descent (Vieta's jumping) : (4a^2-1)^2/(4ab-1) is integer, then a=b

    Prove Method of infinite Descent (Vieta's jumping) : (4a^2-1)^2/(4ab-1) is integer, then a=b

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  19. Integral of 1/(1+x^2)^2 (substitution)

    Integral of 1/(1+x^2)^2 (substitution)

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  20. interview question A bug crawls along the edges of a regular tetrahedron

    interview question A bug crawls along the edges of a regular tetrahedron

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  21. Very funny math question solve x for x^x^n=n

    Very funny math question solve x for x^x^n=n

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  22. Prove Method of infinite Descent (Vieta's jumping) : (x^2+y^2+1)/xy=3

    Prove Method of infinite Descent (Vieta's jumping) : (x^2+y^2+1)/xy=3

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  23. Prove Method of infinite Descent (Vieta's jumping) : (a^2+b^2)/(ab+1) is square, imo1988

    Prove Method of infinite Descent (Vieta's jumping) : (a^2+b^2)/(ab+1) is square, imo1988

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  24. Prove Method of infinite Descent : no nontrivial solutions x^2+y^2=3z^2

    Prove Method of infinite Descent : no nontrivial solutions x^2+y^2=3z^2

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