Evaluate the Sum $$\sum _ { k = 3 } ^ { 6 } \frac { \left( k ^ { 2 } - 2 \right) } { 2 }$$

Multiple Choice

Evaluate the sum. Round to two decimal places, if necessary.
- $$\sum _ { k = 3 } ^ { 6 } \frac { \left( k ^ { 2 } - 2 \right) } { 2 }$$

A) 78
B) 40
C) 21
D) 39