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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Si</font> be   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">A</font> be    <a href="prob_1.html#M2" target="_self">Event</a> of <font color="Maroon">Si</font>, <font color="Maroon">B</font> be    <a href="prob_1.html#M2" target="_self">Event</a> of <font color="Maroon">Si</font>;<br/>





<a NAME="E1:41"/>
( <font color="Maroon">A</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Si</font> &amp; <font color="Maroon">B</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Si</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E2:41"/><b>then </b>
<font color="Maroon">A</font> <a href="subset_1.html#K4">\/</a> <font color="Maroon">B</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Si</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:41"/>
<font color="Maroon">A</font> <a href="subset_1.html#K4">\/</a> <font color="Maroon">B</font> is    <a href="prob_1.html#M2" target="_self">Event</a> of <font color="Maroon">Si</font>
 <b>by </b><i/>;<br/>


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