3
The series is obtained by subtracting a number that reduces by 1 at each stage
18 - 5 = 13
13 - 4 = 9
9 - 3 = 6
6 - 2 = 4
4 - 1 = 3
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24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
13 18 16 21 19 24 22 27 25 ... . This series consists of adding 5 to the first number and subtracting 2 from the next number, repeating the sequence in that order.
The next number in the series 4, 12, 6, 12, 36, 18, 36
24 for each number you add 5 and then subtract 2. 19 plus 5 is 24.
The next number in the series 4-12-6-12-36-18-36.. is 108.