Fill the sequence
Algebra
Level
3
Continue the sequence 0, 1, 2, 4, 7, 12...
HINT: if 0 is the first number of the series, 54 is the ninth.
The answer is 20.
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1 solution
it's the famous Fibonacci series with a small variant: f(n+2) = f(n) + f(n+1) + 1