D. E. Shaw Interview Question
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Interview Question for Software Developer at D. E. Shaw:
Oct 31, 2011
Three of my 150 friends have phone numbers ending in a permutation of the digits 0, 1, 4, and 9. Is this surprising?
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0 of 1 people found this helpful
Jan 5, 2012
the probability of the last 4 digits being a permutation of 0,1,4,9 is
4*3*2*1/10000 = 0.24%
the probability of finding a similar number out of 150 given friend phone numbers is
3/150 = 2%
the probability of the favorable event has increased over 8 times than in the random case, and hence is surprising.
4*3*2*1/10000 = 0.24%
the probability of finding a similar number out of 150 given friend phone numbers is
3/150 = 2%
the probability of the favorable event has increased over 8 times than in the random case, and hence is surprising.
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