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A nucleus "nX^m emit one alpha-particl e...

A nucleus `"_nX^m` emit one `alpha-particl e` and two `beta-particl e` the resulting nucleus is

A

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

B

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

C

`"_nZ^(m-6)`

D

`"_nX^(m-4)`

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