1979 USAMO Problems/Problem 5
Problem
Let 
be distinct subsets of ![$[n]$](http://latex.artofproblemsolving.com/0/d/e/0deff9086fd7840ef23860f5bc924f1d4d2d2310.png)
with 
. Prove that 
for some pair 
.
Solution
| 1979 USAMO (Problems • Resources) | ||
| Preceded by Problem 4 |
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