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MichaelS

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20 Combinatorial proof of $\sum\limits_{k=0}^n {n \choose k}3^k=4^n$ Sep 23 '11
18 What is the fastest way to multiply two digit numbers? Mar 5 '12
9 How many ways to divide group of 12 people into 2 groups of 3 people and 3 groups of 2 people? Sep 17 '11
6 How many ways dividing $n$ balls into $3$ buckets with limitations? Oct 21 '11
3 Find $\sum\limits_{k=\frac{n+1}{2}}^n{n \choose k}$ closed form Oct 22 '11
3 Build recurrence relation from a Combinatorial problem Oct 14 '11
3 How many ways to assemble a team of 5 out of 15 girls and 10 boys with limitations? Oct 19 '11
2 How many ways dividing $n$ different balls into $5$ buckets, so the first bucket must contain at least $3$ balls Sep 25 '11
2 Matrix multiplication proof: $(A+B)^k$ for matrices such that $A^2=B^2=0$ and $AB=BA$ Apr 6 '12
1 How to prove that the union of two subspaces must be subsets of each other? [duplicate] May 31 '12
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