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Use the Indicated Formula to Find the Sum  Use S=n(n+1)2 to find the sum of 1+2+3+…+400. \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.
-  Use S=n(n+1) 2 to find the sum of 1+2+3+…+400. \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

Correct Answer:

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