Question

How do i find the number of terms in geometric sequence: 1/2, 1/4, 1/8, ..., 1/1024?

Answer 1

cos I got 19.54 = 1/2^n-1 and I know it's wrong D:

Answer 2

tn=ar^(n-1)
1/1024 = .5(.5^n-1)
1/512=.5^n-1
log 1/512 = log .5^n-1
-2.71= (n-1) log .5
-2.71=(n-1) (-.3)
9=n-1
10=n

Answer 3

oohh, thank you!! :D

Answer 4

nytime