Explanation by: Gopal Sharma
1st Number 3 = 3rd number, 3rd number 3 = 5th number, 5th number 3 = 7th number

2nd number 3 = 4th number, 4th number 3 = 6th number

18 3 = 21, 21 3 = 24, 24 3 = 27

And 24 3 = 27, 27 3 = 30

Hence, the correct answer is "24".

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