Use Summation Notation
- $$\sum _ { i = 3 } ^ { 6 } \frac { i ! } { ( i - 1 ) ! }$$

Use Summation Notation
- $$\sum _ { i = 3 } ^ { 6 } \frac { i ! } { ( i - 1 ) ! }$$

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