Question 1024276
First, you shouldn't post your email on a public site.
That's an invitation to nonsense and worse.
That being said,
{{{P(4)=C(10,4)*(6/18)^4*(12/18)^(10-4)}}}
{{{P(4)=210*(1/81)*(64/729)}}}
{{{P(4)=13440/59049}}}