Can you solve it? The mystery of Cherry's lottery ball

A logic puzzle about knowledge

Update: Several readers spotted a mistake in the setting of the puzzle. Apologies. (Prem, who set the puzzle, responds below the line). This is the first time in more than three years that I've set a puzzle with such an issue. In order to stop this happening again, if anyone would like to be a 'puzzle-tester' for this blog please get in touch with me on the email address below.

Hi guzzlers