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<b>let </b><font color="Maroon">E</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="finset_1.html#V1">finite</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">A</font> be   <a href="rpr_1.html#NM2">Event</a> of <font color="Maroon">E</font>, <font color="Maroon">B</font> be   <a href="rpr_1.html#NM2">Event</a> of <font color="Maroon">E</font>;<br/>



<b>assume </b><a NAME="E1:44"/>
<font color="Maroon">A</font> <a href="xboole_0.html#R1">misses</a> <font color="Maroon">B</font>
 ;<br/>

<b>then </b> <a href="rpr_1.html#K2" target="_self">prob</a> <font color="Maroon">A</font>,<font color="Maroon">B</font> = 
0 <a href="real_1.html#K6">/</a> <span class="p1">(<span class="default"><a href="rpr_1.html#K1" target="_self">prob</a> <font color="Maroon">B</font></span>)</span>
<b>by </b><i/>
<br/>.= 
0 <a href="real_1.html#K4">*</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="rpr_1.html#K1" target="_self">prob</a> <font color="Maroon">B</font></span>)</span> <a href="real_1.html#K2">"</a> </span>)</span>

;<br/>
<b>hence </b><a NAME="E3:44"/>
 <a href="rpr_1.html#K2" target="_self">prob</a> <font color="Maroon">A</font>,<font color="Maroon">B</font> <a href="hidden.html#R1">=</a> 0
 ;<br/>


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