Question 1026228
a){{{P(R)=6/(6+7+7)=6/20=3/10}}}
b){{{P(W)=7/20}}}
c){{{P(B)=7/20}}}
{{{P(R_or_B)=P(R)+P(B)=6/20+7/20=13/20}}}
d){{{P(R_and_B)=0}}}, you're only choosing one marble and you don't have a color that is red and blue.