SOLUTION: Can someone please tell me if this statement is true or false {3,6,9,12} u {3,9} = {3,6,9,12}

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Question 201861: Can someone please tell me if this statement is true or false
{3,6,9,12} u {3,9} = {3,6,9,12}
Answer by jim_thompson5910(21685) About Me  (Show Source):
You can put this solution on YOUR website!
if the "u" is the union operator, then yes, the statement

{3,6,9,12} u {3,9} = {3,6,9,12}


is true. Why? Recall that the union of two sets is the combination of the two sets (with duplicates removed). Also, it helps to note that if set B is a subset of set A, then

A U B = A