A radioactive nucleus with Z protons and N neutrons emits an α-particle, 2β-particles and 2 gamma rays. The number of protons and neutrons in the nucleus left after the decay respectively, are 
(a) Z – 3, N – 1                  (b) Z – 2, N – 2
(c) Z – 1, N – 3                  (d) Z, N – 4

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