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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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