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Two disjoint events in which one or the other must occur are called?
Complements or complementary events
How do you draw a Venn diagram to the probability of two independent events a and b?
the circles do not overlap at all.
Is one of two events that are the only ones that can possible happen and sum of whose probabilities is 1?
One of a pair of complementary events.
Why do complementary events always have a probability of one?
If an event is absolutely certain to happen is then we say the probability of it happening is 1.Complementary events are such that one of the events musthappen. Therefore the probability of one of a set of complementary events occurring is 1.For instance : The probability that a fair coin when tossed will come down showing heads is 1/2, and that it will show tails is also 1/2.The two events are complementary so the probability that the coin toss will result in either a heads or a tails is 1.Similarly, the probability that a die when rolled will show a number 1, 2, 3, 4, 5 or 6 is 1 as all six events are complementary.
How many outcomes are there in common in complementary events?
1
