Respuesta :
When two event are complementary than the sum of their probabilities is 1 or 100%.
For instance: there is a 60% chance that it will rain so there is a 40% chance that it will not rain. .6 + .4 = 1
For instance: there is a 60% chance that it will rain so there is a 40% chance that it will not rain. .6 + .4 = 1