For the given arithmetic series, what is $\mathrm { S } _ { \mathrm { n } } ?$
-$a _ { 1 } = 21 , d = - 3$, and $n = 17$
A) $- 204$
B) $- 51$
C) $- 102$
D) $- 30$

Question

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The Answer of For the given arithmetic series, what is $\mathrm { S } _ { \mathrm { n } } ?$
-$a _ { 1 } = 21 , d = - 3$, and $n = 17$
A) $- 204$
B) $- 51$
C) $- 102$
D) $- 30$

For the Given Arithmetic Series, What Is Sn?\mathrm { S } _ { \mathrm { n } } ?Sn​?

For the Given Arithmetic Series, What Is $\mathrm { S } _ { \mathrm { n } } ?$