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If (a,b) X species emits first a positron, then two α and two β particles and in the last,

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If (a,b) X species emits first a positron, then two α and two β particles and in the last, one α  is also emitted and gets converts to (c,d) Y species. So correct relation is

(a) c=a-12, d=b-5

(b) c=a-5,d=b-1

(c) c=a-6,d=b-0

(d) c= a-4,d=b-2

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Correct option (a) c=a-12, d=b-5

Explanation :

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