A nucleus .(n)^(m)X emits one alpha-part...

A nucleus `._(n)^(m)X` emits one `alpha`-particle and two `beta^(-)` particles. The resulting nucleus is

`""_(n-2)^(m-4)Y`

`""_(n-4)^(m-6)Z`

`""_(n)^(m-6)Z`

`""_n^(m-4)X`

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