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Multiple choice

Find the term to replace the question mark in order to complete the series. $5, 9, 21, 37, 81, ?$

  1. $153$
  2. $150$
  3. $158$
  4. $151$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is: 5*2-1=9, 9*2+3=21, 21*2-5=37, 37*2+7=81, 81*2-9=153.

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