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A radioactive isotope ZX^A decays in ser...

A radioactive isotope `_ZX^A` decays in series by emitting 3 `alpha`-particles and 2 `beta`-particles. The resultant isotope will be :

A

`_(Z-3)Y^(A-13)`

B

`_(Z-4)Y^(A-12)`

C

`_(Z-5)Y^(A-11)`

D

`_(Z-6)Y^(A-11)`.

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