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

question 45

Multiple Choice

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

• A) 6
• B) 18
• C) 3
• D) 10

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