2007 iTest Problems/Problem 33

Revision as of 22:55, 7 October 2014 by Timneh (talk | contribs) (Created page with "== Problem == How many <math>\textit{odd}</math> four-digit integers have the property that their digits, read left to right, are in strictly decreasing order? == Solution ==")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Problem

How many $\textit{odd}$ four-digit integers have the property that their digits, read left to right, are in strictly decreasing order?

Solution

Invalid username
Login to AoPS