Set operations
Combine sets with and, or and not, then choose the matching regions.
Combine two sets with a single rule or its opposite.
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Turn a rule into a picture.
Combine two sets with a single rule or its opposite.
A and B
Unscored example · no round used
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How to play
Choose the diagram whose striped regions match the rule. And means the overlap; or includes either set and the overlap; but not removes the second set. Not includes everything outside the named set or grouped expression, within the surrounding box. Work inside parentheses first. Stripes mean selected, not empty.
Use touch or a mouse, or Tab to move between controls and Enter or Space to select.
Original set-reasoning exercises. This differs from Venn logic: here you select regions, rather than infer whether a region is empty.
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