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Quantative Aptitude - Number series

      There are a number of points to remember while solving  Number Series

  • Different ways of solving no. series
  1. +1,+2,+3,+4
  2. -1,-2,-3,-4
  3. +1,-1,+1,-1
  4. Perfect square series - This type of series is based on square of a number which is in same order and one square number is missing in that series.                                                                    Example- 441,484,529,576,.?..                                                                                                        Answer-441= 21², 484= 22², 529= 23², 576= 24², 625= 25²
  5. Perfect cube series - This type of series is based on cube of a number which is in same order and one cube no. is missing in that given series.                                                                             Example- 1331,1728,2197,..?..                                                                                                       Answer-11³,12³, 13³, 14³
  6. Geometric series - This type of series is based on ascending and descending order of numbers and each successive number is obtain by multiplying or dividing the previous number with a fixed number.                                                                                                                                    Example- 5,45,405,3645,..?..                                                                                                           Answer- 5×9 = 45, 45×9 = 405, 405×9 = 3645, 3645×9 = 32805.
  7. Two Stage Type Series - A two tier Arithmetic series is one in which the differences of successive numbers themselves form an arithmetic series.
  8. Mixed Series - This type of series are more than one different order are given in a series which arranged in alternatively in a single series or created according to any non-conventional rule.    Example- 11,24,50,102,206,..?..                                                                                                      Answer:  11×2=22+2=24                                                                                                                                24×2=48+2=50                                                                                                                                50×2=100+2=102                                                                                                                          102×2=204+2=206                                                                                                                          206×2=412+2=414

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