!! used as default html header if there is none in the selected theme. Graphic subsets

# Graphic subsets --- Introduction ---

This online exercise helps you to train yourself graphically to the concept of subsets: union, intersection, complement, etc. It can either graphically present a subset and ask you to recognize the corresponding formula, or give a formula of subset and ask you to recognize it graphically.
Configuration of the exercise
• :
• questions (with a score assigned at the end of each session.) .
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