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In the following question, select the missing number from the given series.
5, 9, 13, 17, 21, ?
'4' is added to all the numbers.
5 + 4 = 9
9 + 4 = 13
13 + 4 = 17
17 + 4 = 21
21 + 4 = 25
=> Ans - (C)
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