5:15 AM
Today I retagged a question of this type: You are given numbers of objects in some sets; draw the Venn diagram and calculate the number of elements with some property. I've searched for venn+diagram+number and I see that many older question of this type are tagget elementary-set-theory.
To me this seems closer to discrete-mathematics than to set theory. Perhaps both tags would be the best choice? I am not sure....
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