![[10 points] Give a proof by contradiction: For every 2-dimensional array of blue and gray pebbles, if every row is at most half blue, then there exists a column thats at least half gray.](https://media.cheggcdn.com/media%2F089%2F0897bd6a-a168-4ebb-9d3d-bcfc7d3af101%2FphpA0uw75.png)
[10 points] Give a proof by contradiction: For every 2-dimensional array of blue and gray pebbles, if every row is at most half blue, then there exists a column that’s at least half gray. Show transcribed image text
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