A bag contains tickets numbered from 1 to 30. Three tickets are drawn at random from the bag. Whatis the probability that themaximum no. of the selected tickets exceeds 25???

Let A be the event that none of the selected tickets bear number exceeding 25.

Then required probability

 

Now, total numbers of ways of drawing three tickets out of 30 is

∴ Total number of elementary event

 

and three tickets are drawn from tickets bearing number 1 to 25 can be done in ways

∴ Favourable number of elementary event

 

  • 9

5c3/30c3

  • -4
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