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

Multiple Choice

Use the indicated formula to find the sum.
-Use $S = \frac { n ( n + 1 ) } { 2 }$ to find the sum of $1 + 2 + 3 + \ldots + 7000$ .

A) $24,499,999.5$
B) $24,503,500$
C) $24,496,500$
D) $12,248,250$