Question 81283: find the fourth term of a geometric sequence in which a1=-3 and r=7
Answer by praseenakos@yahoo.com(507)   (Show Source):
You can put this solution on YOUR website! QUESTION:
find the fourth term of a geometric sequence in which a1=-3 and r=7
ANSWER:
A series of the form,
a1, a1r^1, a1r^2, a1r^3, a1r^4,........... is called a geometric progression.
where a is the first term and r is the common ratio.
nth term of a geometric progression is given by the formula,
n th term = a1r^(n-1)
here a1 = -3 and r = 7
so 4 th term = -3 * (7)^(4-1)
==> = -3 * 7 ^ 3
==> = -3*343
==> = -1029
So 4 th term = -1029
Hope you found the explanation useful.
Regards.
Praseena.
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