Ratio of voltages for equal energy in series and parallel combinations of identical capacitors

The same question, asked 2 times: 9 May 2023 S2*, 15 Apr 2026 S1. Every wording below, oldest first.

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Question 1
9 May 2023 S2
29 $The potential difference that must be applied across the series and parallel combination of 4 identical capacitors is such that the energy stored in them becomes the same. The ratio of potential difference in series to parallel combination is$
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Question 2
15 Apr 2026 S1
126 $The potential difference that must be applied across the parallel and series combination of three identical capacitors such that the energy stored in them becomes the same. The ratio of potential difference in parallel to series combination is$
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Question 1