\(\rm 2.\overline{15}\) किस साधारण भिन्न के बराबर है

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Patna High Court Mazdoor Official Paper (Held On: 22 Jun, 2025)
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  1. \(\frac{5}{8}\)
  2. \(\frac{11}{9}\)
  3. \(\frac{71}{33}\)
  4. \(\frac{1}{4}\)

Answer (Detailed Solution Below)

Option 3 : \(\frac{71}{33}\)
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दिया गया है:

आवर्ती दशमलव 2.151515... है।

प्रयुक्त सूत्र:

माना, x = आवर्ती दशमलव है, और दशमलव बिंदु को स्थानांतरित करने के लिए 10 की घात से गुणा करें।

फिर आवर्ती भाग को समाप्त करने के लिए घटाएँ और x के लिए हल करें।

गणना:

माना, x = 2.151515...

100 से गुणा करें (चूँकि 2 अंक आवर्ती हैं):

⇒ 100x = 215.151515...

मूल समीकरण घटाएँ:

⇒ 100x - x = 215.151515... - 2.151515...

⇒ 99x = 213

x के लिए हल करें:

⇒ x = 213 ÷ 99

⇒ x = 71 ÷ 33

∴ सही उत्तर विकल्प (3) है।

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