Question 83788
1, 2, 4, 8....
r = a selection / the previous number
r = 2/1 = 4/2 = 8/4
r = 2
...
(2)^(n - 1) where n = 24
2^(23) = 8,388,608
...
a(1 - r^n)/(1 - r)
(1 - 2^n)/(1 - 2)
2^10 - 1
1023