Find the sum of the first n terms of the following arithmetic sequence.
-$$\mathrm { a } _ { 1 } = - 12 , \mathrm {~d} = - 1 ; \mathrm { n } = 5$$
A) $- 60$
B) $- 17$
C) $- 70$
D) 7

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The Answer of Find the sum of the first n terms of the following arithmetic sequence.
-$$\mathrm { a } _ { 1 } = - 12 , \mathrm {~d} = - 1 ; \mathrm { n } = 5$$
A) $- 60$
B) $- 17$
C) $- 70$
D) 7

Find the Sum of the First N Terms of the Following