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Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 5 years, 1 month
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  • Last seen Mar 16 '16 at 17:54

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22 Show by combinatorial argument that ${2n\choose 2} = 2{n \choose 2} + n^2$ Jan 27 '16
5 How many integer solutions are there to the equation $x_1 + x_2 + x_3 + x_4 = 12$ with restrictions on $x_1,x_2,x_3,x_4$? Jan 27 '16
3 Given $3$ types of coins, how many ways can one select $20$ coins so that no coin is selected more than $8$ times. Feb 2 '16
3 Is $32561698$ divisible by $12$? Mar 2 '16
2 Distribution of distinct object problem Feb 10 '16
1 Let T be a linear transformation. Find the standard matrix of T Feb 15 '16
1 Count the ways to choose distinct subsets $A_0, A_1, . . . , A_n$ of ${1, 2, . . . , n}$ such that $A_0 ⊂ A_1 ⊂ . . . ⊂ A_n$ Jan 27 '16
1 How many different integer solutions are there to the equation $x_1 + x_2 + x_3 + x_4 = 21$ with restrictions Feb 9 '16
1 How many ways are there to place 10 distinct people within 3 distinct rooms with exactly 5 people in the first room and 2 people in the second room? Feb 10 '16
1 Probability of two people picking balls from an infinite pile but have equal winning chances Feb 24 '16
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