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  1. D

    Stupid error = lose a mark?

    You are wrong.
  2. D

    inverse trig and couting probability question

    so, for my answers, you will have to divide by 13!/(3!3!3!) to get the probabilities
  3. D

    inverse trig and couting probability question

    how many ways to arrange EEE? one way. 3! ways if they were all different, but divide by # of identical letters. So yes. Probability just = count them up and divide by total number of possible arrangements.
  4. D

    inverse trig and couting probability question

    12!/(3!3!) - 11!/(3!3!) 11!/(3!3!)
  5. D

    inverse trig and couting probability question

    you divide by 3! to cover the number of identical arrangements you get by arranging 3 N's.
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