Difference between revisions of "1973 USAMO Problems"
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Latest revision as of 17:53, 3 July 2013
Problems from the 1973 USAMO.
Problem 1
Two points 
and 
lie in the interior of a regular tetrahedron 
. Prove that angle 
.
Problem 2
Let 
and 
denote two sequences of integers defined as follows:
, 
, 
, 
, 
.Thus, the first few terms of the sequences are:
,
.Prove that, except for the "1", there is no term which occurs in both sequences.
Problem 3
Three distinct vertices are chosen at random from the vertices of a given regular polygon of 
sides. If all such choices are equally likely, what is the probability that the center of the given polygon lies in the interior of the triangle determined by the three chosen random points?
Problem 4
Determine all the roots, real or complex, of the system of simultaneous equations
,
,
.Problem 5
Show that the cube roots of three distinct prime numbers cannot be three terms (not necessarily consecutive) of an arithmetic progression.
See Also
| 1973 USAMO (Problems • Resources) | ||
| Preceded by 1972 USAMO |
Followed by 1974 USAMO | |
| 1 • 2 • 3 • 4 • 5 | ||
| All USAMO Problems and Solutions | ||
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
