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Union of Sets

A=a,b, B=a,...

Question

$A = {a, b}$ , $B = {a}$ , $C = {b}$ , and $D = {}$ . In the table for the union of A, B, C, and D, how many times does A appear?
$\cup$ A B C D
A
B
C
D

A

6

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B

7

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C

8

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D

9

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Solution

The correct option is D 9
∪ A B C D
A A A A A
B A B A B
C A A C C
D A B C D

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