Find the Indicated Sum $$\sum _ { i = 3 } ^ { 6 } \frac { i ! } { ( i - 1 ) ! }$$

Multiple Choice

Find the indicated sum.
- $$\sum _ { i = 3 } ^ { 6 } \frac { i ! } { ( i - 1 ) ! }$$

A) 3
B) 18
C) 10
D) 6