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gayaneshka [121]
2 years ago
13

The sum of all the positive terms in the geometric sequence 54, - 36, 24, - 16, ... is

Mathematics
1 answer:
Annette [7]2 years ago
8 0

Answer:

  B.  97.2

Step-by-step explanation:

The sequence of positive terms is ...

  54, 24, 10 2/3, 4 20/27, ...

This sequence has first term 54 and common ratio 24/54 = 4/9. The sum of the infinite series is ...

  S = a1/(1 -r) = 54/(1 -4/9) = 54(9/5)

  S = 97.2

The sum of the positive terms in the infinite series is 97.2.

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