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<b>let </b><font color="Maroon">P1</font> be    <a href="prob_1.html#M3">Probability</a> of <font color="Maroon">Sigma</font>;<br/><b>let </b><font color="Maroon">P2</font> be    <a href="prob_1.html#M3">Probability</a> of <font color="Maroon">Sigma</font>;<br/>



<b>assume </b><b>that </b><br/><a NAME="E1:39_1_2"/><i><font color="Green">E83</font></i>: 
for <font color="Olive">A</font> being   <a href="prob_1.html#M2">Event</a> of <font color="Maroon">Sigma</font> holds  <font color="Maroon">P1</font> <a href="prob_1.html#K10">.</a> <font color="Olive">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <span class="p2">(<span class="default"><font color="Olive">A</font> <a href="prob_1.html#K6">/\</a> <font color="Maroon">B</font></span>)</span></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">B</font></span>)</span>
 <b>and </b><br/><a NAME="E2:39_1_2"/><i><font color="Green">E84</font></i>: 
for <font color="Olive">A</font> being   <a href="prob_1.html#M2">Event</a> of <font color="Maroon">Sigma</font> holds  <font color="Maroon">P2</font> <a href="prob_1.html#K10">.</a> <font color="Olive">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <span class="p2">(<span class="default"><font color="Olive">A</font> <a href="prob_1.html#K6">/\</a> <font color="Maroon">B</font></span>)</span></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">B</font></span>)</span>
 ;<br/>

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="39_1_2_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">A</font> be    <a href="prob_1.html#M2">Event</a> of <font color="Maroon">Sigma</font>;<br/><b>thus </b><font color="Maroon">P1</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">A</font> = 
<span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <span class="p2">(<span class="default"><font color="Maroon">A</font> <a href="prob_1.html#K6">/\</a> <font color="Maroon">B</font></span>)</span></span>)</span> <a href="real_1.html#K6">/</a> <span class="p1">(<span class="default"><font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">B</font></span>)</span>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">P2</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">A</font>
<b>by </b><i/>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E4:39_1_2"/>
<font color="Maroon">P1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">P2</font>
 <b>by </b><i/>;<br/>


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