Task: Question Answering
Input (English): Problem: what is the sum of all possible 3 - digit numbers that can be constructed using the digits 2 , 4 , and 5 if each digit can be used only once in each number ? 
Options: a ) 2442 , b ) 2552 , c ) 2662 , d ) 2772 , e ) 2882
Output (English): a