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Let S be the set of the first 21 natural...

Let S be the set of the first 21 natural numbers, then the probability of Choosing `{x,y,z}subeS`, such that x,y,z are in AP, is

A

`5/(133)`

B

`(10)/(133)`

C

`(3)/(133)`

D

`(2)/(133)`

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ARIHANT MATHS ENGLISH-PROBABILITY-Exercise (Questions Asked In Previous 13 Years Exam)
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  14. An experiment has 10 equally likely outcomes. Let A and B be two non-e...

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  19. A fair die is tossed repeatedly until a 6 is obtained. Let X denote th...

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  20. A fair die is tossed repeatedly until a 6 is obtained. Let X denote th...

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  21. In a binomial distribution B (b, p=(1)/(4)), if the probability of at...

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