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

Input: Consider Input: Problem: three unbiased coins are tossed . what is the probability of getting 2 heads and 2 tail ?
Options: a ) 5 / 8 , b ) 1 / 4 , c ) 3 / 8 , d ) 7 / 8 , e ) 1 / 8

Output: a

Input: Consider Input: Problem: there are 23 students in a class . in how many different ways can a committee of 3 students be formed ?
Options: a ) 1254 , b ) 1482 , c ) 1771 , d ) 1875 , e ) 1923

Output: c

Input: Consider Input: Problem: if 4 consecutive letters are selected at random from the english alphabet , then the probability that one of the letters is a vowel is ?
Options: a ) 13 / 23 , b ) 16 / 23 , c ) 11 / 23 , d ) 17 / 23 , e ) 18 / 23
Output: d