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Lapatulllka [165]
2 years ago
6

What is the sum of the geometric sequence-1 6 -36 yes there are 7 terms

Mathematics
2 answers:
vagabundo [1.1K]2 years ago
7 0

Answer:

-39991'

Step-by-step explanation:

We require the sum of 7 terms of the G.S.  -1, 6, -36  .....

The common ratio r = 6/-1 = -6 and the first term = -1.

Sum of n terms = a1 . (r^n  - 1) / (r - 1)

Sum of 7 terms = -1 * (-6)^7 - 1)  / (-6 - 1)

=  -1 * 39991

= -39991 (answer).

amid [387]2 years ago
6 0
-39991 is the awnser
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