Let $f ( x ) = \lfloor x ^ { 3 } / 3 \rfloor$

Short Answer

Let $f ( x ) = \lfloor x ^ { 3 } / 3 \rfloor$ . Find $f ( S )$ if $S$ is:
(a) {-2,-1,0,1,2,3} . (b) {0,1,2,3,4,5} (c) {1,5,7,11} . (d){2,6,10,14} .