Solved

Use the Indicated Formula to Find the Sum $S = \frac { n ( n + 1 ) } { 2 }$

Question 154

Multiple Choice

Use the indicated formula to find the sum.
-Use $S = \frac { n ( n + 1 ) } { 2 }$ to find the sum of $20 + 21 + 22 + \ldots + 725$ .

A) 262,985
B) 262,279
C) 262,260
D) 263,004

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