Use the Indicated Formula to Find the Sum $$\text { Use } S = \frac { n ( n + 1 ) } { 2 } \text { to find the sum of } 1 + 2 + 3 + \ldots + 400 \text {. }$$

question 120

Multiple Choice

Use the indicated formula to find the sum.
- $$\text { Use } S = \frac { n ( n + 1 ) } { 2 } \text { to find the sum of } 1 + 2 + 3 + \ldots + 400 \text {. }$$

• A)8020
• B)80,200
• C)79,800
• D)80,000

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