StatWiz and The Ball Choosing Problem

Problem description You are friends with the most accomplished Statistical Wizard of Qwan named Regressia. You invited Regressia to a party at your place. She likes giving statistical problems to humour her friends at parties. She gives you a box full of NR red, NG green, NB blue and NU uncoloured balls. The total number of balls is N. Then she gives a list of positive integers and asks you calcu