Given a geometric sequence A1=6, r=-5, how do you find the 5th term?
1 Answer
Mar 7, 2016
3750
Explanation:
In the standard geometric sequence:
a , ar ,
#ar^2 , ar^3 ,ar^4 ,.................... , ar^(n-1)# the nth term
#=ar^(n-1)# here
#a = A1 = 6 , r = -5 and n = 5#
#rArr a_5 = 6xx(-5)^4 = 6xx625 = 3750 #
