What is the probability of getting exactly 2 heads in a single throw of five fair coins?  Choices
A) 1/4  B) 3/8  C) 3/16  D) 5/16  E) 11/32
One possible case is HHTTT.   P(HHTTT) = 1/2*1/2*1/2*1/2*1/2 = 1/32   There are 5C2 = 10 possible cases.   P(2 heads) = 10*1/32 = 5/16   The answer is 5/16.
<result>D</result>
What is the probability of getting exactly 2 heads in a single throw of five fair coins?