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Answer : 3 81 Explanation : Answer: C) 81 Explanation: Given the number series is 4, 6, 12, 30, 81, 315.Here it follows a pattern that44 x 1.5 = 66 x 2 = 1212 x 2.5 = 3030 x 3 = 90 not equals to 8190 x 3.5 = 315 Hence the odd one in the series is 81.

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