dhirajx wrote:
It seems there is no detail about children developing inflammation and fever. It is safe to assume there is no A∩B unless it is clearly mentioned in the question?
No, you cannot assume that. It's vise-versa, if there is no overlap, then you'd be told that in one way or another.
When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever ?
(1) 880
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