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Conditional Probability

Twenty ticket...

Question

Twenty tickets are marked the numbers 1, 2, ..... 20. If three tickets be drawn
at random, then what is the probability that those marked 7 and 11 are
among them

A

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B

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C

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D

None of these

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Solution

The correct option is A

7,11 have always to be in that group of three, therefore 3rd ticket may be
chosen in 18 ways.
Hence required probability is

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