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# Look at the series $1.5,2.3,3.1,3.9$ What number should be come next?

$\begin{array}{1 1} 4.2 \\ 4.4 \\ 4.7 \\ 5.1 \end{array}$

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Solution :
In this simple addition series each number increases by $0.8$
Answer : 4.7