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কয়টি দুই-অঙ্কের সংখ্যা 5 দ্বারা বিভাজ্য?

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  1. 19
  2. 20
  3. 17
  4. 18

Answer (Detailed Solution Below)

Option 4 : 18
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Detailed Solution

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ব্যবহৃত সূত্র:

একটি নির্দিষ্ট পরিসরে 5 দ্বারা বিভাজ্য সংখ্যার সংখ্যা খুঁজে বের করতে, নিম্নলিখিত সূত্রটি ব্যবহার করুন:

সংখ্যা = শেষ সংখ্যা - প্রথম সংখ্যা / 5 + 1

গণনা:

প্রথম দুই-অঙ্কের সংখ্যা যা 5 দ্বারা বিভাজ্য = 10

শেষ দুই-অঙ্কের সংখ্যা যা 5 দ্বারা বিভাজ্য = 95

সংখ্যা = 95 - 10 / 5 + 1

⇒ সংখ্যা = 85 / 5 + 1

⇒ সংখ্যা = 17 + 1

⇒ সংখ্যা = 18

∴ সঠিক উত্তর হল বিকল্প (4)।

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