Answer : 4 135 Explanation : Answer: D) 135 Explanation: The given number series is 6, 6, 9, 18, 45, ?Here the series follows a pattern that,6 6 x 1 = 66 x 1.5 = 99 x 2 = 1818 x 2.5 = 4545 x 3 = 135 Hence, the next number in the given number series is 135.

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