In this task, you need to provide the correct option for a given problem on probability from the provided options.

[Q]: Problem: a coin is tossed 8 times . what is the probability of getting exactly 7 heads ? 
Options: a ) 1 / 8 , b ) 1 / 16 , c ) 1 / 32 , d ) 1 / 64 , e ) 1 / 128
[A]: c


[Q]: Problem: jane and thomas are among the 8 people from which a committee of 4 people is to be selected . how many different possible committees of 4 people can be selected from these 8 people if at least one of either jane or thomas is to be selected ? 
Options: a ) 28 , b ) 46 , c ) 55 , d ) 63 , e ) 70
[A]: c


[Q]: Problem: a box contains 2 red balls and 5 black balls . one by one , every ball is selected at random without replacement . what is the probability that the fourth ball selected is black ? 
Options: a ) 1 / 4 , b ) 7 / 5 , c ) 1 / 2 , d ) 5 / 8 , e ) 2 / 3
[A]:
b