+0  
 
0
84
1
avatar+558 

What is ∑n=16[4(−5)n−1]∑n=16[4(−5)n−1] equal to?

 

SamJones  May 17, 2018
 #1
avatar+87294 
+1

This  will be the sum of a geometric series where the first term is 4

The common ratio  is -5

And we will have 6 terms.....so....the sum is

 

first term   [ 1  -  common ratio^number of terms ] / [ 1 - common ratio ]  =

 

4  [1 - (-5)^6]  /  [ 1  - -5 ]  =

 

4 [ 1 - 15625 ] / 6  =

 

(2/3) ( -15624 )  =

 

-10416

 

 

 

cool cool cool

CPhill  May 17, 2018

9 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.