Question 1026474
.
Use the pattern in Pascal's triangle to find the probability of getting 2 heads 
when four fair coins are tossed. (type an integer or a simplified fraction)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
It is {{{C[4]^2*(1/2)^4}}} = {{{6*(1/16)}}} = {{{3/8}}}.

Here  {{{C[4]^2}}}  is  the binomial coefficient equal to {{{(4*3)/(1*2)}}} = 6.
</pre>