need help with the following question!

Problem 6) An urn contains 6 blue balls, 5 yellow balls and 4 red balls. Four balls are drawn without replacement. (1 point) (i) What is the probability that all four balls are blue? (2 points) (ii) What is the probability that two balls are blue and two balls are yellow? (2 points) (iii) TWhat is the probability that at least one of the balls is red? (2 points) (iv) What is the probability that the second ball chosen is red