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In the following question, select the missing number from the given series.
15, 21, 28, 34, ?, 47
'6' and '7' are alternatively added.
15 + 6 = 21
21Â + 7 =Â 28
28Â + 6 =Â 34
34Â + 7 =Â 41
41Â + 6 =Â 47
=> Ans - (A)
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