Question 256261
number of ways to draw one of each ___ 4 * 4 * 4 * 4 = 256


number of ways to draw 4 from 16 ___ 16C4 = (16 * 15 * 14 * 13) / (4 * 3 * 2 * 1) = 1820


probability is ___ 256 / 1820 ___ or .141 (approx)