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Hepl #7

 Mar 12, 2018
 #1
avatar+94586 
+2

7.  Sum of a geometric series =

 

First term  * [ 1  - common ratio^ (number of terms) ] / [ 1 - commo ratio ]  =

 

1 [ 1 - 4^6] / [ 1 - 4 ]  =  1365

 

 

8.   Sum of the first seven terms is

 

6 [ 1   - (-4)^7 ] / [ 1 - (-4)  ]  =

 

6 [ 1 - (-4)^7 ] / 5   =  19662

 

 

9. Sum of 1st 10 terms  =

 

12 [ 1 - 2^10] / [ 1 - 2 ]   =  12276

 

 

cool cool cool

 Mar 12, 2018

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