MathDB
Addition error

Source:

November 21, 2005

Problem Statement

The addition below is incorrect. The display can be made correct by changing one digit dd, wherever it occurs, to another digit ee. Find the sum of dd and ee. \begin{tabular}{ccccccc}& 7 & 4 & 2 & 5 & 8 & 6 \\ + & 8 & 2 & 9 & 4 & 3 & 0\\ \hline 1 & 2 & 1 & 2 & 0 & 1 & 6 \end{tabular} <spanclass=latexbold>(A)</span> 4<spanclass=latexbold>(B)</span> 6<spanclass=latexbold>(C)</span> 8<spanclass=latexbold>(D)</span> 10<spanclass=latexbold>(E)</span> More than 10<span class='latex-bold'>(A)</span>\ 4 \qquad <span class='latex-bold'>(B)</span>\ 6 \qquad <span class='latex-bold'>(C)</span>\ 8 \qquad <span class='latex-bold'>(D)</span>\ 10 \qquad <span class='latex-bold'>(E)</span>\ \text{More than } 10