Find a and r for the geometric sequence with the given terms.
a11 = 1 and a13 = 0.0625
Find the ratio between the given terms:
Since there are 2 multiplications from a11 to a13, take the square root to get r:
r = (0.0625)1/2 = .25
Then use the formula to find a.
an = arn – 1
a11 = ar10
1 = a(.25)10
We conclude that