Difference between revisions of "2008 AIME I Problems/Problem 7"
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Revision as of 20:18, 4 July 2013
Problem
Let be the set of all integers
such that
. For example,
is the set
. How many of the sets
do not contain a perfect square?
Solution
The difference between consecutive squares is , which means that all squares above
are more than
apart.
Then the first sets (
) each have at least one perfect square. Also, since
(which is when
), there are
other sets after
that have a perfect square.
There are sets without a perfect square.
See also
2008 AIME I (Problems • Answer Key • Resources) | ||
Preceded by Problem 6 |
Followed by Problem 8 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 | ||
All AIME Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.