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| revprev | Admin | Jun 14'24 at 23:06 | −186 | ||
| revcur | Bot | (Created page with "<div class="d-none"><math> \newcommand{\NA}{{\rm NA}} \newcommand{\mat}[1]{{\bf#1}} \newcommand{\exref}[1]{\ref{##1}} \newcommand{\secstoprocess}{\all} \newcommand{\NA}{{\rm NA}} \newcommand{\mathds}{\mathbb}</math></div> Suppose that <math>n</math> people have their hats returned at random. Let <math>X_i = 1</math> if the <math>i</math>th person gets his or her own hat back and 0 otherwise. Let <math>S_n = \sum_{i = 1}^n X_i</math>. Then <math>S_n</math> is the...") | Jun 9'24 at 4:24 | +756 |