Answers

2016-07-18T00:38:02+08:00
All you need to do,  is to find the GM  of   4 & 6
  
   GM of 4 & 6   =  √(4 .6)      /   GM of  a,b   =  √(a*b)
                          =  √24
                          =  2√6
       so the fifth term is   2√6
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