AMC 10A 2011 Problem 6

Past Contests AMC 10 AMC 10A - 2011
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1

Set A has 20 elements, and set B has 15 elements. What is the smallest possible number of elements in A \cup B, the union of A and B ?

Answer Choices
A. 5
B. 15
C. 20
D. 35
E. 300