The n-th term of a geometric series is ...
an = a1·r^(n-1)
To fill in the formula, we need a1·r^n, so need to multiply the last term shown by r.
The value of r is 32/8 = 4, and the other terms of interest are a1 = 8, a1·r^(n-1) = 8388608. So, the sum is ...
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