The probability is 1/2 that a certain coin turns up heads on any given toss. If the coin is tossed five times, what is the probability that the coin turns up tails on at least one of the tosses? Choose the most appropriate option.
A) 7/8 B) 15/16 C) 31/32 D) 21/32 E) 31/64
P(5 heads)= 1/2*1/2*1/2*1/2*1/2=1/32.   P(at least one tail)=1-1/32=31/32.   The answer is 31/32.
<result>C</result>
The probability is 1/2 that a certain coin turns up heads on any given toss. If the coin is tossed five times, what is the probability that the coin turns up tails on at least one of the tosses?