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

Multiple Choice

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

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