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Mathematics, 02.06.2021 01:40 Hruai
Alexey wrote '1*2*3*... 9 = 21' on the board, inserting a plus or minus signs in place of each little star. Sasha changed some of these signs to their opposites so that the result he got was 20. Prove that one of the boys made a mistake.
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Alexey wrote '1*2*3*... 9 = 21' on the board, inserting a plus or minus signs in place of each littl...
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