Question 1025870
<pre>
{{{matrix(1,3,

"P(fair|HH)",""="",P(matrix(1,3,fair,AND,HH))/"P(HH)"))}}}

{{{matrix(1,9,

P(matrix(1,3,fair,AND,HH)),
""="",P(matrix(3,1,selecting,fair,coin))*
P(matrix(3,1,H,1st,time))*P(matrix(3,1,H,2nd,time)),""="",(2/3)(1/2)(1/2),""="",2/12,""="",1/6


     )}}}

{{{matrix(1,7,

P(matrix(1,3,2-headed,AND,HH)),
""="",P(matrix(3,1,selecting,2-headed,coin))*
P(matrix(3,1,H,1st,time))*P(matrix(3,1,H,2nd,time)),""="",(1/3)(1)(1),""="",1/3


     )}}}

{{{matrix(1,13,

"P(HH)",
""="",
P(matrix(1,3,fair,AND,HH)),
""+"",
P(matrix(1,3,2-headed,AND,HH)),
""="",
1/6+1/3,
""="",
1/6+2/6,
""="",
3/6,
""="",
1/2))}}}

{{{


matrix(1,7,

"P(fair|HH)",""="",P(matrix(1,3,fair,AND,HH))/"P(HH)",""="",(1/6)/(1/2),""="",(1/6)*(2/1)=1/3))




}}}

Edwin</pre>