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

[Q]: Problem: if a ã — b = 2 a - 3 b + ab , then 3 ã — 2 + 2 ã — 3 is equal to :
[A]: 7


[Q]: Problem: a diagonal of a polygon is an segment between two non - adjacent vertices of the polygon . how many diagonals does a regular 20 - sided polygon have ?
[A]: 170', 'c ) 1425', 'd ) 2025', 'e ) 2500'


[Q]: Problem: if a / b = 4 / 3 , then ( 3 a + 2 b ) / ( 3 a - 2 b ) = ?
[A]:
3