<PRE><B>Question 1167581</B>
.


As the problem is presented in the post, &amp;nbsp;it is incomplete and, &amp;nbsp;&amp;nbsp;T H E R E F O R E , &amp;nbsp;&amp;nbsp;can &amp;nbsp;NOT &amp;nbsp;be solved.




In order for the problem formulation be complete, &amp;nbsp;it &amp;nbsp;MUST &amp;nbsp;say that the events &amp;nbsp;A1, &amp;nbsp;A2 &amp;nbsp;and &amp;nbsp;A3 


are  &amp;nbsp;DISJOPINT &amp;nbsp;(or &amp;nbsp;MUTUALLY &amp;nbsp;EXCLUSIVE, &amp;nbsp;which is &amp;nbsp;EQUIVALENT).




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