Thanks.

Is there any answer for Q3, 4, 5

You mention shattering doesn’t have to happen for all possible configurations/subsets as long as there is 1 configuration/subset that can be shattered. So why can’t 4 points be shattered in 2 dimensions? There is the case where 2 points on the left and 2 points on the right and separated in the middle. So wouldn’t these 4 points be shattered?

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