Out of 6 balls a pair is to be selected for a game. At most, how many different pairs are possible?	Choose the correct choice from the following answers:
A) 100	B) 90	C) 50	D) 15	E) 25
N=6C2=6!/(4!2!)=6*5/2= 
<gadget id="calculator">6*5/2</gadget>
<output>15</output>
15   Correct Option: 15
<result>D</result>
Out of 6 balls a pair is to be selected for a game. At most, how many different pairs are possible?