Question 1146538
{{{matrix(1,11,

P(matrix(4,1,at,least,one,head)),
""="",
1-P(matrix(3,1,exactly,4,tails)),
""="",
1-(1/2)(1/2)(1/2)(1/2),
""="",
1-1/16,
""="",
15/16,
""="",
0.9375)}}}
<pre>Edwin</pre>