+0  
 
0
155
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avatar+4690 

Help 53

 May 7, 2018
 #1
avatar+94545 
+1

Let's look at the first few terms

 

-4 +  2  - 1 +  1/2.......

 

The common ratio, r,  =  -1/2   .....since  l r  l  < 1....this will converge

And the first term is  -4

 

So...the sum  is given by

 

[ first term  ]  /  [ 1  - r ]  =

 

-4  /  [ 1 - (-1/2) ] =

 

-4  /  [ 3/2]   =

 

-8 / 3

 

 

 

cool cool cool

 May 7, 2018

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