Question 1065618
{{{P(R)=15/(15+15+5+10)=15/45=1/3}}}
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First find the probability that it is black,
{{{P(B)=5/45=1/9}}}
So the probability that it is not black is the complement,
{{{P=1-1/9}}}
{{{P=8/9}}}
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{{{P=P(P)+P(W)}}}
{{{P=15/45+10/45}}}
{{{P=25/45}}}
{{{P=5/9}}}