general term of GS is ar^(n-1)
for yours, a = 2, r = -3
general term = 2(-3)^(n-1) = 162
(-3)^(n-1) = 81 , but I know (-3)^4 = 81
n-1 = 4
n = 5 , so 162 is the 5th term
Which term of the geometric sequence 2,-6,18 ....... 162
4 answers
Reason to write n-1 is equal to 4
5=n
Which term of the geometric sequence 2,-6,18,...... is 162 ?
1 answer