+0  
 
0
30
1
avatar

An infinite geometric series has common ratio -1/5  and sum 40.  What is the first term of the series?

 Oct 7, 2020
 #1
avatar
0

Sum = F / [1 - r]

40    = F / [1 - (- 1/5)]

40    = F / [6 / 5]

F =40 x [6/5]

F =240 / 5

F = 48 - First term

 Oct 7, 2020

22 Online Users

avatar