Posted by C on Wednesday, March 17, 2010 at 12:58am.
42
2* (1 +1.1 + 1.1^2+ 1.1^3 +....1.1^25
geometric series with r = 1.1, n=26, a = 1
2 [ar^0 + ar^1 + ar^2 .. + a r^(n-1)]
=2 [ (r^n -1) / (r-1) ]
=2 [ (10.9)/(.1)]
=218km
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