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Tuesday, 12 january 2016 |
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Foi rupte... |
Proposed by
batranetupetre |
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| (13 comments) | 2.560 times displayed |
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Am rupt la intamplare 15 foi dintr-o carte, am adunat numerele scrise pe paginile acestora si am obtinut 2015. E corect? |
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NU!
Paginile unei foi sunt numerotate cu doua numere consecutive, un numar par si unul impar, deci este un numar de forma 2k+2k+1=4k+3. Cum am rupt 15 foi atunci suma este de forma 15*(M4+3)=M4+45=M4+1
Dar 2015=M4+3 |
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Tags:
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carte,
foi rupte,
2015,
problema zilei,
probleme de matematica,
amuzante,
matematica amuzanta
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