Instructions: In this task, you need to provide the correct option for a given problem on probability from the provided options.
Input: Problem: a coin is tossed 7 times . what is the probability of getting exactly 6 heads ? 
Options: a ) 7 / 32 , b ) 3 / 64 , c ) 5 / 64 , d ) 3 / 128 , e ) 7 / 128
Output:
e