खालीलपैकी कोणती परिमेय संख्या नाही?

\(\sqrt {{3^2} + {4^2}}, \sqrt {12.96}, \sqrt {125\;} {}\) आणि \(\sqrt {900} \)

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NTPC CBT-I (Held On: 5 Jan 2021 Shift 1)
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  1. \(\sqrt {12.96} \)
  2. \(\sqrt {125} \)
  3. \(\sqrt {900} \)
  4. \(\sqrt {{3^2} + {4^2}} \)

Answer (Detailed Solution Below)

Option 2 : \(\sqrt {125} \)
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
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Detailed Solution

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गणना:

परिमेय संख्या - p/q च्या स्वरुपात असलेली संख्या 

दिलेल्या पर्यायानुसार

⇒ \(√ {{3^2} + {4^2}} \) = √25 = 5 ही परिमेय संख्या आहे

⇒ \( √ {12.96} \) = 3.6 ही परिमेय संख्या आहे

⇒ √125 = 5√5 ही परिमेय संख्या नाही

⇒ √900 = 30 ही परिमेय संख्या आहे

∴ √125 ही परिमेय संख्या नाही.

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