In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[Q]: Problem: if a * b * c = ( √ ( a + 2 ) ( b + 3 ) ) / ( c + 1 ) , find the value of 6 * 15 * 3 . 
Options: a ) 8 , b ) 5 , c ) 11 , d ) 3 , e ) 4
[A]: d


[Q]: Problem: when average age of 22 members are 0 , how many members greater than 0 ? 
Options: a ) 17 , b ) 21 , c ) 22 , d ) 24 , e ) 25
[A]: b


[Q]: Problem: if a - b = 3 and a ( power 2 ) + b ( power 2 ) = 39 , find the value of ab . 
Options: a ) 15 , b ) 8 , c ) 4 , d ) 10 , e ) 3
[A]:
a