Question 1021031
You can use a shortcut for the first and last.
{{{P(4)=(4/15)(4/15)(4/15)(4/15)=256/50625}}}
{{{P(0)=(11/15)(11/15)(11/15)(11/15)=14641/50625}}}
For the middle one, you need the entire formula,
{{{P(3)=C(4,3)*(4/15)^3*(11/15)^(4-3)}}}
{{{P(3)=4*(64/3375)*(11/15)}}}
{{{P(3)=2816/50625}}}