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Posted by Moby Dick
on 19/6/2009, 9:14 am, in reply to "Re: Singing Competition"
Hi Mark,
I'm sorry, but I think that your answer is wrong. I am guessing that the mistake you are making is counting in a similar way to the following:
ab - cd - e - f - g - h - i - j - k
ab - c - de - f - g - h - i - j - k
But failing to account for the permutations that swap {b,d} and {b,e} in the two lines above, which should be:
ab - cd - e - f - g - h - i - j - k
ad - cb - e - f - g - h - i - j - k
ab - c - de - f - g - h - i - j - k
ae - c - db - f - g - h - i - j - k
Am I correct?
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