If a is an element of the set {12, 13, 15, 16, 18, 19, 21, 22}, what is the value of a? (1)a is a multiple of 3. (2)a is even.

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If <em>a</em> is an element of the set {12, 13, 15, 16, 18, 19, 21, 22}, what is the value of <em>a</em>? (1)<em>a</em> is a multiple of 3. (2)<em>a</em> is even.