svenkatr

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89 Answers

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18	How to prove this binomial identity $\sum_{r=0}^n {r {n \choose r}} = n2^{n-1}$?
14	Solve by induction: $n!>(n/e)^n$
14	Understanding a famous riddle
12	Intuition behind the ILATE rule
9	Why are generating functions useful?

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3,591 Reputation

+5	If a 1 meter rope is cut at two uniformly randomly chosen points (to give three pieces), what is the average length of the smallest piece?
+10	Math for “Electrical Engineering & Communication Technology” recommendation
+10	Why are generating functions useful?
+10	Generating functions for combinatorics

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3 Questions

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20	If a 1 meter rope is cut at two uniformly randomly chosen points (to give three pieces), what is the average length of the smallest piece?
16	Status of a conjecture about powers of 2
4	Condition number of $A^{-1}B$ where $A$ and $B$ are banded toeplitz matrices.

71 Tags

61 combinatorics × 20	25 inequality × 6
40 algebra-precalculus × 6	22 generating-functions × 3
30 real-analysis × 6	20 matrices × 6
29 calculus × 7	20 binomial-coefficients × 3
26 linear-algebra × 8	18 homework × 9

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$Mathematics Stack Exchange$

Mathematics

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