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Number Puzzle #133 1,20,?,266,675

(4 votes, average: 3.50 out of 5)

April 1, 2015 by puzzler 2 Comments

Number-Puzzle-#133-1,20,..,266,675
Number Puzzle #133

Find the missing number in the series
1,20,?,266,675

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Comments

  1. kamlesh kumar says

    June 13, 2016 at 10:57 am

    The series is
    1,20,x,266,675
    taking difference of adjacent terms
    19,x−20,266−x,409
    taking difference of adjacent terms again
    x−39,286−2x,143+x
    taking difference of adjacent terms again
    325−3x,3x−143
    taking difference of adjacent terms again
    6x−468

    Let this be zero so 6x−468=0 or x=78

    Reply
  2. ub says

    April 3, 2015 at 1:14 am

    78

    Reply

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