How many diagonals does a polygon with 19 sides have, if one of its vertices does not connect to any diagonal?  Choose the correct choice from the following answers
A) 135	B) 125	C) 120	D) 110	E) 140

Rationale: "if i calculate it using the formulae , # diagonals = n ( n - 3 ) / 2 each vertex sends of n - 3 diagonals n = 19 - 1 then 18 * ( 18 - 3 ) / 2 = 135 correct option : a"
Answer: A