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Playing Lotto (Posted on 2005-01-14) Difficulty: 4 of 5
A Lotto bet is picking 6 numbers out of 49 -- if you pick the correct combination, you get the jackpot!

If N persons play, there will be many repeats, since it's highly probable that some combinations will be chosen by two persons or more. (This is known as the "birthday paradox".)

What's the expected number of DIFFERENT combinations that will be chosen, if N persons play? (Assume these persons pick their combinations totally randomly.)

See The Solution Submitted by Federico Kereki    
Rating: 3.7500 (4 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Some Thoughts re(2): my solution....QUESTION | Comment 8 of 13 |
(In reply to re: my solution by Charlie)

Charlie
Your results seem more logical than those derived from my formula.
Pray tell me where did I err.
THANKS
ady
  Posted by Ady TZIDON on 2005-01-15 21:04:24

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