Prove that `sqrt5/3` is irrational.
Let `sqrt5/3 `is rational
`:. 3(sqrt5/3) = sqrt5` is rational
(∵ Q product of two rationals is also rational)
but this is contradiction that `sqrt5` is irrational.
`:.sqrt5/3` is irrational proved
Concept: Proofs of Irrationality
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