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1. নিম্নে প্রদত্ত জোড়গুলির মধ্যে কোনগুলি আইসোটোপ ?

  • A. X2457 , X2456&#
  • B. X2457 , X2456&#
  • C. X2457 , X2456&#
  • D. X2457 , X2456&#

Answer: Option A

Explanation:

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