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I need puzzles
1
Name:
Anonymous
2007-10-24 20:45
Post your math puzzles!
3
Name:
Anonymous
2007-10-24 22:43
Prove that
0 ≤ yz + zx + xy - 2xyz ≤ 7/27
where
x
,
y
and
z
are non-negative real numbers for which
x + y + z = 1
.
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