The probability is 1/2 that a certain coin turns up heads on any given toss. If the coin is tossed two times, what is the probability that the coin turns up tails on at least one of the tosses?
Answers:
A) 1/4	B) 3/4	C) 3/8	D) 5/8	E) 7/8
P(2 heads)= 1/2*1/2=1/4.   P(at least one tail)=1-1/4=3/4.   The answer is 3/4.
<result>B</result>
The probability is 1/2 that a certain coin turns up heads on any given toss. If the coin is tossed two times, what is the probability that the coin turns up tails on at least one of the tosses?