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11273 . কোন ধারার n তম পদ 3n + 1 হলে, ধারাটি নিচের কোনটি?  

  • A. 3, 6, 9, 13, 16, .........
  • B. 4, 7, 10, 13, 16, ..........
  • C. - 1, - 2, 1, 4, 7, ...........
  • D. 2, 5, 8, 11, 14, ............
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