Sorry, 答案應該是2.22580645161
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hoho365
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2014-09-16 17:40:13
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#Python code:
a = 0.69
b = 1 - a
average = 0
left = 1.0
i = 0
while i < 1000:
average += i * b * left
left = left * a
i = i + 1
print average