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syed514

our n will be 5-1 =4

and with the first term of 17 with the common ration of 3.1 our 5th sequence term will be 
17(3.1^4) = 1570

HomertheGenius

The 1st term of the sequence:
a 1 = 17
r = 3.1
a n = a 1 r^(n-1)
a 5 = a 1 r^4
a 5 = 17 3.1^(4) = 17 92.3521
Answer:
a 5 = 1,569.9857

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