Selecting an integer at random that ends in 1, 4 or 6 (or any of the 120 sets of three 1-digit values).
Picking a black ball out of a bag when there are 3x black balls and 7k balls of other colours.
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Events with a 0.3 percent probability are considered to have a low likelihood of occurring. Some examples could include winning a specific lottery with long odds, being struck by lightning, or encountering a rare natural disaster. However, it is important to note that the specific events with a 0.3 percent probability can vary widely depending on the context.
They are "events that have the same probability". Nothing more, nothing less.
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.
The probability of flipping one coin and getting tails is 1/2. In order to find the probability of multiple events occurring, you find the product of all the events. For 3 coins the probability of getting tails 3 times is 1/8 because .5 x .5 x .5 = .125 or 1/8.
There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes.However, if you assume that they are independent events then, given that the probability of a boy is approx 0.52, the probability of three boys and a girl is 0.2669.
Independent events.