Question
Find a formula for
1/2, -1/4, 1/6, -1/8, 1/10...
So I know that the sequence is just adding 2 to the bottom but i don't know how to write it with a formula including n's..im stuck
1/2, -1/4, 1/6, -1/8, 1/10...
So I know that the sequence is just adding 2 to the bottom but i don't know how to write it with a formula including n's..im stuck
Answers
Reiny
This is a geometric sequence where
a=1/2 and r = -1/2
t(n) = ar^(n-1)
= (1/2)(-1/2)^n-1)
= (-1)^(n-1)*(1/2)^n
a=1/2 and r = -1/2
t(n) = ar^(n-1)
= (1/2)(-1/2)^n-1)
= (-1)^(n-1)*(1/2)^n