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

[EX Q]: Problem: assume that f ( 1 ) = 0 and f ( m + n ) = f ( m ) + f ( n ) + 4 ( 9 mn - 1 ) . for all natural numbers ( integers > 0 ) m and n . what is the value of f ( 17 ) ?
[EX A]: 4832

[EX Q]: 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 ?
[EX A]: 3 / 8

[EX Q]: Problem: the mean proportional between 4 and 16 is ?
[EX A]:
1