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@justinvoss
Created November 23, 2011 17:11
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Tennis Ball Pyramid
def pyramid(level):
if level == 1:
return 1
return (level * level) + pyramid(level-1)
assert pyramid(1) == 1
assert pyramid(2) == 5
assert pyramid(3) == 14
print "Tennis balls in a 33-level pyramid: %d" % pyramid(33)
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