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

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 ?
170', 'c ) 1425', 'd ) 2025', 'e ) 2500'

Problem: if x and j are integers and 2 x j = 11 , then 4 x + j can not be
17

Problem: how many different positive integers exist between 10 ^ 5 and 10 ^ 6 , the sum of whose digits is equal to 2 ?
6