4, 6 , 9 , 13 , 11 , 8 , 4 , 6,_ ,..............
Answer
4, 6 , 9 , 13 , 11 , 8 , 4 , 6,_ ,..............
+2 +3 +4 -2 -3 -4 +2
Next number 6 + 3 = 9
4, 6 , 9 , 13 , 11 , 8 , 4 , 6, 9,..............
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