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0, 1, 2, 4, 7, 12, 20 () how to find the rule to fill in the number?
0+1+1=2
1+2+1=4
2+4+1=7
4+7+1=12
7+12+1=20
12+20+1=33
It's the sum of the first two numbers plus one, so write 33 in parentheses
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