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Let S be the set of the first 18 natural...

Let S be the set of the first 18 natural numbers, then the probability of
choosing `{x, y}inS`, such that `x^3+y^3` is divisible by 3, is

A

`(1)/(6)`

B

`(1)/(5)`

C

`(1)/(4)`

D

`(1)/(3)`

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