+0  
 
+1
176
2
avatar+412 

what is  equal to?

 Apr 9, 2019
 #1
avatar
0

Ded me now

 Apr 9, 2019
 #2
avatar+106519 
+1

The common ratio, r,   is 3

The first term = 3

 

So....this sum is equal to

 

3 [ 1 - r^*8] / [ 1 - r]  =

 

3 [ 1 - 3^8] / 1 - 3 ]  

 

3  [ -6560] / [-2]  =

 

3 * 3280  =

 

9840

 

 

cool  cool cool

 Apr 9, 2019

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