The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: the average of first 17 even numbers is ?

Output: 18


Input: Consider Input: Problem: the set s consists of 5 numbers : { 1 , 2,3 , 4,5 } . if all possible subsets including the null set are created and one subset is chosen at random , what is the probability that the subset has 3 or 4 as its largest number ?

Output: 3 / 8


Input: Consider Input: Problem: the ratio of the radius of two circles is 1 : 5 , and then the ratio of their areas is ?


Output: 1 : 25