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Find a Formula for the Sum of the N Terms 15,325,9125,27625,K\frac { 1 } { 5 } , \frac { 3 } { 25 } , \frac { 9 } { 125 } , \frac { 27 } { 625 } , \mathbf { K }

Question 80

Multiple Choice

Find a formula for the sum of the n terms of the sequence. 15,325,9125,27625,K\frac { 1 } { 5 } , \frac { 3 } { 25 } , \frac { 9 } { 125 } , \frac { 27 } { 625 } , \mathbf { K }


A) 3n5n2(5n) - \frac { 3 ^ { n } - 5 ^ { n } } { 2 \left( 5 ^ { n } \right) }
B) 3(3n5n) 2(5n) - \frac { 3 \left( 3 ^ { n } - 5 ^ { n } \right) } { 2 \left( 5 ^ { n } \right) }
C) 3n15n\frac { 3 ^ { n - 1 } } { 5 ^ { n } }
D) 3n+5n8(5) n\frac { 3 ^ { n } + 5 ^ { n } } { 8 ( 5 ) ^ { n } }
E) 15n\frac { 1 } { 5 ^ { n } }

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