102841 – We Solve Problem

Problem № 102841 12-13

Two weighings. There are 7 coins which are identical on the surface, including 5 real ones $($all of the same weight$)$ and 2 counterfeit coins $($both of the same weight, but lighter than the real ones$)$. How can you find the 3 real coins with the help of two weighings on scales without weights?

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