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

[Q]: Problem: the radius of a sphere is increased by 50 % . the increase in surface area of the sphere is :
Options: a ) 168 , b ) 125 , c ) 186 , d ) 197 , e ) 191
[A]: b

[Q]: Problem: six dots are evenly spaced on the circumference of a circle . how many combinations of three dots can we make from these 6 dots that do not form an equilateral triangle ?
Options: ['a ) 18', 'b ) 17', 'c ) 16', 'd ) 15', 'e ) 14']
[A]: a

[Q]: Problem: the ratio of the volumes of two cubes is 3375 : 1331 . what is the ratio of their total surface areas ?
Options: a ) 225 : 121 , b ) 221 : 127 , c ) 225 : 191 , d ) 181 : 161 , e ) 81 : 182
[A]:
a