A store sells nine different kinds of shirts. If we want to buy two different kinds of shirts, how many possible combinations of two shirts can we buy?  Choose the correct choice from the following answers: A) 32 B) 33 C) 34 D) 35 E) 36
9C2=36.   The answer is 36.
<result>E</result>
A store sells nine different kinds of shirts. If we want to buy two different kinds of shirts, how many possible combinations of two shirts can we buy?