The smallest set Y such that Y- 1-2 - 1-2-3-5-9 is a-b-9 - Find -b-a-

Given, Y∪{ 1,2 }= { 1,2,3,5,9 }. So smallest possible set of Y is { 3,5,9 }. ⇒ |a b|=5 3=2 ...

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Properties of Set Operation

The smallest ...

Question

The smallest set $Y$ such that $Y \cup {1, 2} = {1, 2, 3, 5, 9}$ is ${a, b, 9}$ . Find $| b - a |$ .

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