Wednesday

January 28, 2015

January 28, 2015

Posted by **MIA** on Wednesday, July 24, 2013 at 12:02am.

- STATISTICS -
**Graham**, Wednesday, July 24, 2013 at 4:29amHint: It's the complement of the probability that none of them is among that group.

Let En be the indexed event that the nth person selected is not one of the three oldest.

1 - P(E1) P(E2|E1) P(E3|E1 and E2)

= 1 - (9/12) (8/11) (7/10)

= 0.61818....

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