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avatar+125 

A car dealership sold one car in its first month of business. The number of cars it solf doubled each month.

what was the total number of cars the dealership sold during the first 12 months?

 Mar 20, 2019
 #2
avatar+475 
-2

1st month 1 car 

2nd month 2 car's 

3rd month 4 car's 

4th month 8 car's 

5th month 16 car's  

6th month 32 car's 

7th month 64 car's 

8th month 128 car's 

9th month  256 car's 

10th month 512 car's 

11th month 1024 car's 

12th month 2048 car's 

 

 

 

Total car's = 4095

 Mar 20, 2019
edited by HiylinLink  Mar 20, 2019
 #3
avatar+90 
+1

1st month 1 car 

2nd month 2 car's 

3rd month 4 car's 

4th month 8 car's 

5th month 16 car's  

6th month 32 car's 

7th month 64 car's 

8th month 128 car's 

9th month  256 car's 

10th month 512 car's 

11th month 1024 car's 

12th month 2048 car's 

 Mar 20, 2019
 #4
avatar+19326 
+3

Geometric series with r = 2   a1 = 1   n = 12

 

Sumn =  a1(1-r^n) / (1-r)   = 4095

 Mar 20, 2019

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