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4 cards from this section. Quick, good the night before a test.
Using sets A = {1, 2}, B = {2, 3}, calculate |A ∪ B|.
Apply the principle of inclusion-exclusion.
If |A| = 4 and |B| = 6 with |A ∩ B| = 2, what is |A ∪ B|?
Remember the formula for union of two sets.
What is the formula for finding the cardinality of the union of two sets?
Remember how elements are counted in both sets.
True or False: The inclusion-exclusion principle can be applied to any number of sets.
Think about expanding the principle beyond two sets.
You have 10 different books, and you want to choose at least 3 for a reading group. How many selections can you make without duplicating those books?
Consider breaking down the selections by the number of books chosen.
In a class of 50 students, 20 study Math, 30 study Science, 10 study both. How many study only one subject?
Draw a Venn diagram and look at overlaps.
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