Difference between revisions of "2012 AMC 10B Problems/Problem 22"
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− | <math>\textbf{(A)}\ \120\qquad\textbf{(B)}\512\qquad\textbf{(C)}\ \1024\qquad\textbf{(D)}\ 181,440\qquad\textbf{(E)}\ \362,880</math> | + | <math>\textbf{(A)}\ \ 120\qquad\textbf{(B)}\ 512\qquad\textbf{(C)}\ \ 1024\qquad\textbf{(D)}\ 181,440\qquad\textbf{(E)}\ \ 362,880</math> |
Revision as of 01:04, 24 December 2012
=Problem 22
Let (,
, ...
) be a list of the first 10 positive integers such that for each
either
or
or both appear somewhere before
in the list. How many such lists are there?