A box contains 2 red chips and 2 blue chips. If two chips are selected at random without replacement, what is the probability that the chips are different colors?  Choose the correct choice from the following answers:  A) 1/2  B) 4/3  C) 7/12  D) 2/3  E) 7/10
Total selection ways: 4C2=4!/2!2!=6   Selecting one blue chip out of two: 2C1=2!/1!1!=2   Selecting one red chip out of four: 2C1=2!/1!1!=4   Thus, (2C1*2C1)/4C2=(2*4)/6=8/6=4/3=4/3
<result>B</result>
A box contains 2 red chips and 2 blue chips. If two chips are selected at random without replacement, what is the probability that the chips are different colors?