There are 10 oranges on a table, and a pair of oranges is to be selected. At most, how many different pairs are possible?
Choose the correct choice
A) 100 B) 90 C) 50 D) 45 E) 25
N=10C2=10!/(8!2!)=10*9/2= 
<gadget id="calculator">10*9/2</gadget>
<output>45</output>
45   Correct Answer: 45
<result>D</result>
There are 10 oranges on a table, and a pair of oranges is to be selected. At most, how many different pairs are possible?