Let X and Y be the following sets:
X = \{5,10,15\}X={5,10,15}X, equals, left brace, 5, comma, 10, comma, 15, right brace
Y = \{3,6,9,12,15\}Y={3,6,9,12,15}Y, equals, left brace, 3, comma, 6, comma, 9, comma, 12, comma, 15, right brace
Which of the following is the set X \cup YX∪YX, \cup, Y?

Given:

Let X and Y be two sets.

The two sets are given by and

We need to determine the value of the set

Value of the set :

The value of the set is the set that contains all the elements that are at least in one of the two sets.

Hence, the union of the set is given by

Arranging in ascending order, we get;

Thus, the union of the sets X and Y is

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step-by-step explanation: