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प्रश्न
Prove that `2sqrt7` is irrational.
बेरीज
उत्तर
Let is rational
`:.2sqrt7xx(1/2)=sqrt7`
(∵ Q division of two rational no. is also rational)
`:. sqrt7` is rational
but this is contradition that is irrational.
`:.2sqrt7` is irrational
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