MathDB
Counting integers.

Source: AMC 10 2006A, Problem 21

February 6, 2006
AMC

Problem Statement

How many four-digit positive integers have at least one digit that is a 2 or a 3? <spanclass=latexbold>(A)</span>2439<spanclass=latexbold>(B)</span>4096<spanclass=latexbold>(C)</span>4903<spanclass=latexbold>(D)</span>4904<spanclass=latexbold>(E)</span>5416 <span class='latex-bold'>(A) </span> 2439 \qquad <span class='latex-bold'>(B) </span> 4096 \qquad <span class='latex-bold'>(C) </span> 4903 \qquad <span class='latex-bold'>(D) </span> 4904 \qquad <span class='latex-bold'>(E) </span> 5416