The pattern alternates between two sequences: one decreasing by 1 (18, 13) and the other decreasing by 2 (4, 6). Following this pattern, the next number after 6 should be 3 (6 - 3), and the next number after 13 should be 12 (13 - 1). Thus, the next two numbers in the sequence are 12 and 3.
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the answer is 72.:)
34
18. 3+1=4, 4+2=6, 6+3=9, 9+4=13, 13+5=18.
The next figure would be 21, followed by 11 & 10.