Difference between revisions of "1987 AHSME Problems/Problem 12"

(Created page with "==Problem== In an office, at various times during the day the boss gives the secretary a letter to type, each time putting the letter on top of the pile in the secretary's in-bo...")
 
(Problem)
Line 1: Line 1:
 
==Problem==
 
==Problem==
  
In an office, at various times during the day the boss gives the secretary a letter to type, each time putting the letter on top of the pile in the secretary's in-box. When there is time, the secretary takes the top letter off the pile and types it. If there are five letters in all, and the boss delivers them in the order 1\ 2\ 3\ 4\ 5, which of the following could not be the order in which the secretary types them?
+
In an office, at various times during the day the boss gives the secretary a letter to type, each time putting the letter on top of the pile in the secretary's in-box. When there is time, the secretary takes the top letter off the pile and types it. If there are five letters in all, and the boss delivers them in the order <math>1\ 2\ 3\ 4\ 5</math>, which of the following could not be the order in which the secretary types them?
  
 
<math>\textbf{(A)}\ 1\ 2\ 3\ 4\ 5 \qquad
 
<math>\textbf{(A)}\ 1\ 2\ 3\ 4\ 5 \qquad
Line 7: Line 7:
 
\textbf{(C)}\ 3\ 2\ 4\ 1\ 5 \qquad
 
\textbf{(C)}\ 3\ 2\ 4\ 1\ 5 \qquad
 
\textbf{(D)}\ 4\ 5\ 2\ 3\ 1 \qquad
 
\textbf{(D)}\ 4\ 5\ 2\ 3\ 1 \qquad
\textbf{(E)}\ 5\ 4\ 3\ 2\ 1 \qquad</math>
+
\textbf{(E)}\ 5\ 4\ 3\ 2\ 1 \qquad</math>
  
 
== See also ==
 
== See also ==

Revision as of 07:43, 23 October 2014

Problem

In an office, at various times during the day the boss gives the secretary a letter to type, each time putting the letter on top of the pile in the secretary's in-box. When there is time, the secretary takes the top letter off the pile and types it. If there are five letters in all, and the boss delivers them in the order $1\ 2\ 3\ 4\ 5$, which of the following could not be the order in which the secretary types them?

$\textbf{(A)}\ 1\ 2\ 3\ 4\ 5 \qquad \textbf{(B)}\ 2\ 4\ 3\ 5\ 1 \qquad \textbf{(C)}\ 3\ 2\ 4\ 1\ 5 \qquad \textbf{(D)}\ 4\ 5\ 2\ 3\ 1 \qquad \textbf{(E)}\ 5\ 4\ 3\ 2\ 1 \qquad$

See also

1987 AHSME (ProblemsAnswer KeyResources)
Preceded by
Problem 11
Followed by
Problem 13
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
All AHSME Problems and Solutions

The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. AMC logo.png