Meanwhile, one of the newer researchers has worked out that, in the earlier formula:
0/10 * 0 + 1/10 * 1/4 + 2/10 * 2/4 + 3/10 * 3/4 + 4/10 * 1
...that first term 0/10 * 0 has the 0/10 subterm representing "The probability that the proportion of RIGHTs are zero, given that the first ball landed RIGHT" and the 0 subterm representing "The probability that ball 2 lands RIGHT, given that the proportion of RIGHTs are zero."