|
One item is filed under this topic.
 |
|
|
|
|
|
|
|
|
Odds and evens in an n by n+1 table |
2010-01-21 |
|
From Shankar:
The boxes of an n * (n+1) table ( n rows and n+1 columns) are filled with integers.
Prove that one can cross out several columns ( not all of them !) so that after this operation
all the sums of the numbers in each row will be even.
Answered by Robert Dawson. |
|
|
|
