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muminat
3 years ago
7

NEED HELP ASAP GOT 5 MINUTES PLEASEEE!!!! WILL GIVE ANYTHING

Mathematics
1 answer:
arsen [322]3 years ago
4 0

<u>Answer</u>

129


<u>Explanation</u>

−3+6−12+24−...

The series is a geometric progression.

The first term (a) = -3

Common ration (r) = 6/-3

                          = -2

The formula for getting the sum of a geometric progression is

Sum = a(rⁿ - 1)/(r - 1)

          = -3(-2⁷ - 1)/(-2 - 1)

          = -3(-128-1)/-3

            = (-3 × -129)/-3

              = -129

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