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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 not consecutive is,

A

`(17)/(70)`

B

`(34)/(70)`

C

`(51)/(70)`

D

`(34)/(35)`

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