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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
21 + 7 = 28
28 + 6 = 34
34 + 7 = 41
41 + 6 = 47
=> Ans - (A)
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