Nuclide X can decay by two routes. In Route 1 alpha ($\alpha$) decay is followed by beta-minus ($\beta^{-}$) decay. In Route 2 $\beta^{-}$ decay is followed by $\alpha$ decay. P and R are the intermediate products and Q and S are the final products.

Route 1

$\mathrm{X} \stackrel{\alpha}{\longrightarrow} \mathrm{P} \stackrel{\beta^{-}}{\longrightarrow} \mathrm{Q}$

Route 2

$\mathrm{X} \stackrel{\beta^{-}}{\longrightarrow} \mathrm{R} \stackrel{\alpha}{\longrightarrow} \mathrm{S}$

Which statement is correct?