Arthur wrote that 15 – 14.7 = 3.

use the drop-down menus to explain why 3 is incorrect.

15 and 14.7 are ? 1 apart, so 15 – 14.7 must be ? 1.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?