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: 6 points lie on the circumference of a ellipse . what is the positive difference between the number of triangles and the number of quadrilaterals that can be created by connecting these points ?
Options: a ) 4 , b ) 6 , c ) 5 , d ) 15 , e ) 20
[A]: c

[Q]: Problem: a rectangular floor that measures 15 meters by 18 meters is to be covered with carpet squares that each measure 3 meters by 3 meters . if the carpet squares cost $ 12 apiece , what is the total cost for the number of carpet squares needed to cover the floor ?
Options: a ) $ 200 , b ) $ 240 , c ) $ 360 , d ) $ 960 , e ) $ 1,920
[A]: c

[Q]: Problem: the number 110 can be written as sum of the squares of 3 different positive integers . what is the sum of these 3 different integers ?
Options: a ) 10 , b ) 12 , c ) 18 , d ) 14 , e ) 17
[A]:
c