silemus.
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  1. 14Arrangements with repeats
  2. 16Two cards both aces
  3. 18Birthday paradox, 23 people
  4. 21Bayes' theorem on disease test
  5. 22Bayes' theorem on urns
  6. 23Total probability, defective part
  7. 34Finding cc for a density
  8. 35Expected value of XX
  9. 41Sampling distribution of mean
  10. 4295% CI for the mean
  11. 45Covariance from E[XY]
  12. 46Correlation from covariance
  13. 48zz test statistic
  14. 50Stationary distribution, 2 states
  15. 51Hypergeometric probability

14Arrangements with repeats

How many distinct arrangements are there of the letters of LEVEL?

Treat LEVEL as 5 letters with L and E each repeated twice. Divide the no-repeat count 5! by 2! for the L's and 2! for the E's: 120/(2×2) = 30 distinct arrangements.

How good is this answer?