3, -6 , 12, 4, 20 



Start with first term 



 3 -  9 = ->second term

-6 + 18 = ->third term

12 -  8 = ->fourth term

 4 + 16 = ->fifth term

20 -  7 = 13 ->next term; so, answer is 

then comes

13 + 14 = 

27 -  6 =  and so on 

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