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PEN S Problems
33
33
Part of
PEN S Problems
Problems
(1)
S 33
Source:
5/25/2007
Four consecutive even numbers are removed from the set
A
=
{
1
,
2
,
3
,
⋯
,
n
}
.
A=\{ 1, 2, 3, \cdots, n \}.
A
=
{
1
,
2
,
3
,
⋯
,
n
}
.
If the arithmetic mean of the remaining numbers is
51.5625
51.5625
51.5625
, which four numbers were removed?
modular arithmetic
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