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I stumbled upon this math puzzle over one android app.

You need to find the unknown number in the puzzle.

92 = 725
61 = 215
74 = 327
52 = ?

According to the author of the app, the right answer is 121. But I cannot find why. What is the logic for this answer?

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Simple, really:

ab = a^3 - b^2

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  • $\begingroup$ Would you like to elaborate more? I do not get it? $\endgroup$
    – linok
    Dec 7, 2021 at 11:04
  • $\begingroup$ for example: 52 -> $5^3$ - $2^2$ = 125 - 4 = 121. $\endgroup$
    – Florian F
    Dec 7, 2021 at 11:05

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