নিম্নলিখিত কোনটি \(\sqrt{5}\) এবং \(\sqrt{7}\) এর মধ্যে একটি মূলদ সংখ্যা?

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NTPC CBT-I (Held On: 20 Jan 2021 Shift 1)
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  1. \(4\frac{1}{5}\)
  2. \(3\frac{1}{5}\)
  3. \(2\frac{2}{5}\)
  4. \(1\frac{1}{5}\)

Answer (Detailed Solution Below)

Option 3 : \(2\frac{2}{5}\)
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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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প্রদত্ত 

√ 5 এবং √ 7

ধারণা

মূলদ সংখ্যা হলো সেই সংখ্যাগুলি যা সমাপ্ত, অ সমাপ্ত বা পুনরাবৃত্ত হয়।

গণনা 

√5 = 2.236 এবং √7 = 2.64

মূলদ সংখ্যা 2.33... এবং 2.64... এর মধ্যে অবস্থিত

সুতরাং, শুধুমাত্র \(2{2\over5}\) হলো সেই সংখ্যা যা 2.33 এবং 2.64 এর মধ্যে অবস্থিত।

\(2{2\over5}\) \(\sqrt{5}\) এবং \(\sqrt{7}\) এর মধ্যে একটি হলো মূলদ সংখ্যা।

 

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