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ตัวเลขที่หายไป

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  • 8, ? , 14, 17, 20
    11
  • 1/2 , 1/4 , ? , 1/16 , 1/32 , 1/64
    1/8
  • 3, ? , 27, 81, 243
    9
  • -5, 10, -20, ? , -80, 160
    40
  • 400, 200, 100, ? , 25
    50
  • 5, 13, ? , 29, 37
    21
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