શ્રેણીમાં ખૂટતું પદ શોધો: $7, 4, 5, 9, ?, 52.5, 160.5$

  • A
    $18$
  • B
    $19.5$
  • C
    $20$
  • D
    $20.5$

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નીચેની સંખ્યા શ્રેણીમાં પ્રશ્નાર્થ ચિહ્ન $(?)$ ની જગ્યાએ શું આવશે?
$4, 9, 19, 34, 54, ?$

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