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Which number will complete the series?6 , 8 , 17 , 19 , 28 , 30 , ?
32
37
38
39
The numbers '2' and '9' are alternatively added.
6 + 2 = 8
8 + 9 = 17
17 + 2 = 19
19 + 9 = 28
28 + 2 = 30
30 + 9 = 39
=> Ans - (D)
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