soal combinasi binomial 50c1*50c2+50c2*50c3+..........+50c49*60c50= ? berapakah nilainya dengan rumus ! bukan jawaban saja ! saya butuhkan rumusnya !! jawaban b

[tex]\displaystyle C_1^{50}C_2^{50}+C_2^{50}C_3^{50}+...+C_{49}^{50}C_{50}^{50} \\ $Rumus:$ \\ C_1^nC_2^n+...+C_{n-1}^nC_n^n = (2^{n-1}-1)^2 \\ C_1^{50}C_2^{50}+...+C_{49}^{50}C_{50}^{50} = (2^{50-1}-1)^2 = (2^{49}-1)^2[/tex]