2,4,11,39.5,?

Dear Student,
Please find below the solution to the asked query:

$$\begin{gathered} \mathrm{We} \mathrm{have} \\ 2,4,11,39.5 \\ 2\times 1.5+1=4 \\ 4\times 2.5+1=11 \\ 11\times 3.5+1=39.5 \\ 39.5\times 4.5+1=178.75 \end{gathered}$$



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