Question 27: The next number in the sequence: 1 ; 3 ; 4 ; 7 ; 11 ; 18 ; ……

We see

\(\begin{array}{l}1 + 3 = 4\\3 + 4 = 7\\4 + 7 = 11\\7 + 11 = 18\end{array}\)

Or since the third term, the sum of the two preceding terms is equal to the next term.

From there we have the number to fill in is 11 + 18 = 29

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