A) \[{}_{20}^{40}A,\,\,\,\,\,\,_{18}^{40}B\]
B) \[{}_{8}^{20}A,\,\,\,\,\,\,_{18}^{40}B\]
C) \[{}_{28}^{58}A,\,\,\,\,\,\,_{28}^{74}B\]
D) \[{}_{8}^{20}A,\,\,\,\,\,\,_{35}^{74}B\]
E) None of these
Correct Answer: A
Solution :
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