Look at this series: 1.5, 2.3, 3.1, 3.9,

Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #3332