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find the sum of the first seven terms of the geometric sequence - 3/2, 3, -6​

Sagot :

LIA4241GO

Answer:

3/4

Step-by-step explanation:

Given:

r= 3/-3/2

r= -2

n=7

a1= -3/2

Solution:

S = (a1r^n-1)/r

S= (-3/2(-2)^7-1)/-2

S= 3/4

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