A) P (only one of them occurs)\[=P\,({{\bar{E}}_{1}}{{E}_{2}}{{E}_{3}}+{{E}_{1}}{{\bar{E}}_{2}}{{E}_{3}}+{{E}_{1}}{{E}_{2}}{{\bar{E}}_{3}})\]
B) P (none of them occurs)\[=P\,({{\bar{E}}_{1}}+{{\bar{E}}_{2}}+{{\bar{E}}_{3}})\]
C) P (at least one of them occurs)\[=P\,({{E}_{1}}+{{E}_{2}}+{{E}_{3}})\]
D) P (all three occurs)\[=P\,({{E}_{1}}+{{E}_{2}}+{{E}_{3}})\]
E) None of these
Correct Answer: C
Solution :
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