How many elements are in A1 ∪ A2 if there are 12 elements in A1, 18 elements in A2, and A1 ⊆ A2? The number of elements in A1 ∪ A2 is

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 46SE: How many ways can a committee of 3 freshmen and 4 juniors be formed from a group of 8 freshmen and...
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How many elements are in A1 ∪ A2 if there are 12 elements in A1, 18 elements in A2, and

A1 ⊆ A2?

The number of elements in A∪ A2 is

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