Answer:
4
Step-by-step explanation:
4x+5+3x-2=31
7x+3=31
7x=28
x=4
In the Explanation
(a)From the attached probability tree, the possible outcomes are:
RR,RP,RG,RB,PR,PP,PG,PB,GR,GP,GB,GG,BR,BP,BG,BB
(b)Probability Distribution of Drawing Pink Marbles