Did you solve it? The enduring appeal of Venn diagrams
by Alex Bellos from Science | The Guardian on (#4M5MB)
The solutions to today's puzzles
Earlier today I set you these four Venn diagram teasers:
1) For each of the regions marked A to D below, think of a fraction that could belong in it, or say that it is impossible. (Each circle represents the set of fractions described by its rule.)
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