A radioactive sample disintegrates via two independent decay processes having half lives \({\mathrm{T}}_{1/2}^{(1)}\) an…

\({\mathrm{T}}_{1/2}=\frac{{\mathrm{T}}_{1/2}^{(1)}{\mathrm{T}}_{1/2}^{(2)}}{{\mathrm{T}}_{1/2}^{(1)}+{\mathrm{T}}_{1/2}^{(2)}}\)

\({\mathrm{T}}_{1/2}={\mathrm{T}}_{1/2}^{(1)}+{\mathrm{T}}_{1/2}^{(2)}\)

\({\mathrm{T}}_{1/2}=\frac{{\mathrm{T}}_{1/2}^{(1)}+{\mathrm{T}}_{1/2}^{2}}{{\mathrm{T}}_{1/2}^{(1)}-{\mathrm{T}}_{1/2}^{(2)}}\)

None of these