Question 1088322
<pre>
{{{matrix(1,3,
"P(X|Y)",
""="",
P(matrix(1,3,X,and,Y))/"P(Y)" )}}}

{{{matrix(1,3,
"P(B|A)",
""="",
P(matrix(1,3,B,and,A))/"P(A)" )}}}

B and A is the same as A and B

{{{matrix(1,3,
"P(B|A)",
""="",
P(matrix(1,3,A,and,B))/"P(A)" )}}}

{{{matrix(1,3,
.7,
""="",
P(matrix(1,3,A,and,B))/.8 )}}}

Multiply both sides by .8

{{{matrix(1,3,
.56,
""="",
P(matrix(1,3,A,and,B)) )}}}

Edwin</pre>