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### Questions (32)

 7 All permutations of $1,2,…,n$ such that each element is larger than all previous elements or smaller than all previous elements 6 Prove that the maximum score difference between two consecutive teams in a tournament with $n$ teams is $n$ 4 A triple integration that need change of boundary 4 Combinatorial proof $\sum_i^{\lfloor{n/2}\rfloor} (-1)^i {n-i\choose i} 2^{n-2i} = n+1$ 3 Find a Curve that is perpendicular to another curve

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### Tags (57)

 0 combinatorics × 7 0 partial-derivative × 4 0 calculus × 6 0 combinations × 3 0 derivatives × 6 0 sequences-and-series × 3 0 ordinary-differential-equations × 5 0 integration × 3 0 limits × 4 0 induction × 3

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