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- Oct 6th 2010, 07:34 PM #1

- Joined
- Jan 2010
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- 89

## Urn question

An urn contains 20 chips, 10 marked H and 10 marked C. Randomly select chips, one at a time, without replacements. After 10 chips have been selected, let X equal the difference between the numbers of H anc C chips that have been selected.

Define the pmf of X.

- Oct 6th 2010, 07:39 PM #2