Use Summation Notation to Write the Sum $$12 + 36 + 108 + \ldots + 8,748$$

Multiple Choice

Use summation notation to write the sum.? $$12 + 36 + 108 + \ldots + 8,748$$ ?

A) $$\sum _ { n = 1 } ^ { 7 } 12 ( 3 ) ^ { n - 1 }$$
B) $$\sum _ { n = 1 } ^ { 7 } 12 ( 3 ) ^ { n + 1 }$$
C) $\sum _ { n = 1 } ^ { 6 } 12 ( 3 ) ^ { n - 1 }$
D) $\sum _ { n = 1 } ^ { 7 } 3 ^ { n - 1 }$
E) $\sum _ { n = 1 } ^ { 7 } 12 ( 3 ) ^ { n }$