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 নিম্নলিখিত সংখ্যা জুটিগুলির মধ্যে কোনটি যমজ মৌলিক সংখ্যা নয়?

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RRC Group D Previous Paper 40 (Held On: 15 Oct 2018 Shift 2)
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  1. 197, 199
  2.  167, 169
  3. 137, 139
  4. 107,109

Answer (Detailed Solution Below)

Option 2 :  167, 169
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 ধারণা :

যমজ মৌলিক সংখ্যা হল সেই সমস্ত মৌলিক সংখ্যার জুটি যাদের মধ্যে দুই-এর (2) অন্তর থাকে। অন্য ভাষায় বললে বলা চলে, একটি যমজ মৌলিক সংখ্যাজুটির মধ্যে পার্থক্যও একটি মৌলিক সংখ্যা অর্থাৎ দুই।

গণনা :

167, 169 ছাড়া অন্য সমস্তই যমজ মৌলিক সংখ্যা।

কারণ 169 হচ্ছে 13এর গুণিতক, যা একটি মৌলিক সংখ্যা বা যমজ মৌলিক সংখ্যার একটি হতেই পারবে না।

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