Difference between revisions of "1951 AHSME Problems/Problem 31"
(→Solution) |
(→See Also) |
||
| Line 17: | Line 17: | ||
== See Also == | == See Also == | ||
| − | {{AHSME 50p box|year=1951|num-b= | + | {{AHSME 50p box|year=1951|num-b=30|num-a=31}} |
[[Category:Introductory Algebra Problems]] | [[Category:Introductory Algebra Problems]] | ||
Revision as of 12:20, 2 February 2013
Problem
A total of 
handshakes were exchanged at the conclusion of a party. Assuming that each participant was equally polite toward all the others, the number of people present was:
Solution
The handshake equation is 
, where 
is the number of people and 
is the number of handshakes. There were handshakes, so 
The factors of 
are:
.
As we can see, only 
fit the requirements 
if was an integer.
Therefore, the answer is 
See Also
| 1951 AHSC (Problems • Answer Key • Resources) | ||
| Preceded by Problem 30 |
Followed by Problem 31 | |
| 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 • 31 • 32 • 33 • 34 • 35 • 36 • 37 • 38 • 39 • 40 • 41 • 42 • 43 • 44 • 45 • 46 • 47 • 48 • 49 • 50 | ||
| All AHSME Problems and Solutions | ||
