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In the following question, select the missing number from the given series.
147, 153, 159, ?, 171, 177
'6' is added to all the numbers.
147 + 6 = 153
153 + 6 = 159
159 + 6 = 165
165 + 6 = 171
171 + 6 = 177
=> Ans - (D)
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