The general Venn diagram for two sets has four regions (Figure 2.7), and the one for three

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The general Venn diagram for two sets has four regions (Figure 2.7), and the one for three sets has eight regions (Figure 2.10). Use patterns to develop a formula for the number of regions in a Venn diagram with n sets.

Figure 2.7

U B Reg. Region III Region II IV Region I Y


Figure 2.10

U 2,4 6,8 A C B 5,7 1,3 9

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