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If A is a set with 29 elements and B is a subset of A with 16 elements, what is the number of elements of A - B? 

          If A is a set with 29 elements and B is a subset of A with 16 elements, what is the number of elements of A - B?
If A is a set with 29 elements and B is a subset of A with 16 elements, what is the number of elements of A - B?

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Elementary and Intermediate Algebra
Elementary and Intermediate Algebra
Alan S. Tussy, R. David Gustafson 5th Edition
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If A is a set with 29 elements and B is a subset of A with 16 elements, what is the number of elements of A-B ? If A is a set with 29 elements and B is a subset of A with 16 elements, what is the number of elements of A -- B?
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Transcript

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00:01 In this problem, we are given the number of elements in the set a and the set b and in the set a intersection b.
00:07 We need to determine the number of elements in a union b.
00:11 So the number of elements in a union b, we can represent it like this, n of a union b.
00:17 And we have a known formula for this as n of a plus n of b minus n of a intersection b.
00:29 So n of a is the number of elements in a, and that is given to be 13...
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