SOLUTION: Find the sum of the first eight term. 2,4,8

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Question 1093783: Find the sum of the first eight term. 2,4,8
Answer by ikleyn(52788) About Me  (Show Source):
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The sequence is

n:            1  2  3   4   5   6    7    8
Sequence[n]:  2  4  8  16  32  64  128  256    (the degrees of 2: 2%5En )


The sum is S =  2%5E9-1 = 511.