(a) A box contains 8 red balls and 8 blue balls, and 4 balls arc taken at random without replacement. What is the probability that 2 red balls and 2 blue balls are taken?
(b) A box contains 50,000 red balls and 50,000 blue balls, and 4 balls arc taken at random without replacement. Estimate the probability that 2 red balls and 2 blue balls are taken.