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

Example Input: Problem: if a - b = 5 and a 2 + b 2 = 31 , find the value of ab .
Example Output: 3

Example Input: Problem: what is the units digit of 17 ^ 83 × 13 ^ 82 × 11 ^ 67 ?
Example Output: 4

Example Input: Problem: a meeting has to be conducted with 5 managers . find the number of ways in which the managers may be selected from among 9 managers , if 3 managers will not attend the meeting together .
Example Output:
1.24