It seems to me that if the probability of Trump winning is 35% and the probability of Cruz winning is 65%, then the probability of Trump or Cruz winning is 100% (since the probability of Cruz AND Trump wining is 0%).
It seems to me that if the probability of Trump winning is 35% and the probability of Cruz winning is 65%, then the probability of Trump or Cruz winning is 100% (since the probability of Cruz AND Trump wining is 0%).