SOLUTION: Find the sum of first 7 terms 4,12,36?

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Question 924963: Find the sum of first 7 terms 4,12,36?
Found 2 solutions by TimothyLamb, MathTherapy:
Answer by TimothyLamb(4379)   (Show Source): You can put this solution on YOUR website!
4 + 4*3 + 4*3*3 + 4*3*3*3 + 4*3*3*3*3 + 4*3*3*3*3*3 + 4*3*3*3*3*3*3 = ?
4 + 12 + 36 + 108 + 324 + 972 + 2916 = 4372
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answer:
4372
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Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
Find the sum of first 7 terms 4,12,36?


This is a geometric progression (GP) so use the formula for the sum of a G.P.: 





 is the sum of the series you're seeking



Common ratio or  

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