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Sum Binary Digits (Posted on 20120116) 

f(n) represents the sum of the digits of the binary representation of n, where n is a positive integer with 1 ≤ n ≤ 2012.
Determine the probability that f(n) ≥ 3. What is the probabiliy that f(n) ≥ 4?
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Submitted by K Sengupta

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