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Alternating Number Series Puzzle

Alternating Number Series Puzzle - 14 January

Find the missing number in the series below

13   -21    34    -55    ?    -144
For Solution : Click Here

2 comments:

  1. Replies
    1. 13 -21 34 -55 89 -144

      Assuming first two numbers are base, ignoring the sign
      13+21 = 34
      21+34 = 55
      55+89 =144
      Now just put minus sign alternately

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