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Feller's coin-tossing constants : ウィキペディア英語版
Feller's coin-tossing constants
Feller's coin-tossing constants are a set of numerical constants which describe asymptotic probabilities that in ''n'' independent tosses of a fair coin, no run of ''k'' consecutive heads (or, equally, tails) appears.
William Feller showed〔Feller, W. (1968) An Introduction to Probability Theory and Its Applications, Volume 1 (3rd Edition), Wiley. ISBN 0-471-25708-7 Section XIII.7〕 that if this probability is written as ''p''(''n'',''k'') then
:
\lim_ p(n,k) \alpha_k^=\beta_k\,

where α''k'' is the smallest positive real root of
:x^=2^(x-1)\,
and
:\beta_k=.
==Values of the constants==

For k=2 the constants are related to the golden ratio and Fibonacci numbers; the constants are \sqrt-1=2\varphi-2=2/\varphi and 1-1/\sqrt. For higher values of k they are related to generalizations of Fibonacci numbers such as the tribonacci and tetranacci constants.

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