Question 844909
a){{{P(R)=6/(6+3+6)=6/15=2/5}}}
{{{P(B)=3/15=1/5}}}
{{{P(R or B)=P(R)+P(B)=2/5+1/5=3/5}}}
b) 
{{{P(-B)=1-P(B)=1-1/5=4/5}}}