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ICE Princess25 [194]
3 years ago
10

Find r for the geometric series with s5 = 484, a1 = 4, a5 = 324

Mathematics
1 answer:
sleet_krkn [62]3 years ago
4 0
A5 / a1 =  r^4  = 324/4 

So r^4 = 81

r = +/- 3

If  r = 3 :-

S5  = 4 *  (3^5-1) / (3-1)  = 484

so r = 3 Answer
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