Teacher: In this task, you need to provide the correct option for a given problem on probability from the provided options.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Problem: in a throw of a coin find the probability of getting a tail ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 2 / 5 , e ) 2 / 7
Solution: a
Reason: "s = { h , t } e = { t } p ( e ) = 1 / 2 answer is a"

Now, solve this instance: Problem: if a coin has an equal probability of landing heads up or tails up each time it is flipped , what is the probability that the coin will land heads up exactly once in 3 consecutive flips ? 
Options: a ) 0.125 , b ) 0.25 , c ) 0.75 , d ) 0.375 , e ) 0.666
Student:
d