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

[EX Q]: Problem: 12 business executives and 7 chairmen meet at a conference . if each business executive shakes the hand of every other business executive and every chairman once , and each chairman shakes the hand of each of the business executives but not the other chairmen , how many handshakes would take place ? 
Options: a ) 150 , b ) 131 , c ) 115 , d ) 90 , e ) 45
[EX A]: a

[EX Q]: Problem: the length of a rectangle is halved , while its breadth is tripled . watis the % change in area ? 
Options: a ) 43 % , b ) 47 % , c ) 50 % , d ) 65 % , e ) 68 %
[EX A]: c

[EX Q]: Problem: a rectangle a has an area of 30 square centimeters . square b has a perimeter of 16 centimeters . if square b is placed within square a and a random point is chosen within square a , what is the probability the point is not within square b ? 
Options: ['a ) 9 / 30', 'b ) 14 / 30', 'c ) 4 / 9', 'd ) 3 / 5', 'e ) 6 / 25']
[EX A]:
b