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2005 AMC 10B Problems/Problem 20

Revision as of 18:03, 23 August 2011 by Explogabloger (talk | contribs) (→‎Problem)

Problem

What is the average (mean) of all -digit numbers that can be formed by using each of the digits 1, 3, 5, 7, 8 and exactly once?


$\mathrm{(A)}48000\qquad\mathrm{(B)}49999.5\qquad\mathrm{(C)}53332.8\qquad\mathrm{(D)}55555\qquad\mathrm{(E)}56432.8$

Solution

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