Q .     A radioactive nucleus (initial mass number `A` and atomic number `Z`) emits `3 alpha`-particles and `2` positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

JEE 2010
A

`(A-Z-8)/(Z-4)`

B

` (A-Z-4)/(Z-8)`

C

`(A-Z-12)/(Z-4)`

D

`(A-Z-4)/(Z-2)`

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