"combinari de 10 luate de 4 plus
combinari de 12 luate de 5 egal cu
combinari de 12 ouate de 7 plus
combinari de 10 luate de 6 "
C⁴₁₀ + C⁵₁₂ = C⁷₁₂ + C⁶₁₀
[tex]\it C^4_{10} + C^5_{12} = C^7_{12} + C^6_{10} \Leftrightarrow\ C^4_{10} + C^5_{12} = C^{12-7}_{12} + C^{10-6}_{10} \Leftrightarrow\ \\ \\ \Leftrightarrow\ C^4_{10} + C^5_{12} = C^5_{12} + C^4_{10}\ \ (A)[/tex]
