When does the union of two events occur?

What do you call the collection of all outcomes that is an element of one or the other of the sets A and B, or both of them?

In the formula for finding the probability of a union of two events:

P (A ∪ B) = P (A) + P (B) - P (A ∩ B) subtracted from P (A) + P (B)?

From a deck of 52 cards, what is the probability of drawing a number card or a spade?

Two dice are tossed at the same time, what is the probability of getting a sum greater than 10?

Fifteen balls in a jar are numbered from 1 to 15. A ball is drawn at random. What is the probability that the number on the ball is less than 6 or even.

What is P (A ∩ B) if P (A) = 0.65, P (B) = 0.30 and P (A ∪ B) = 0.75?

Mang Pepito has a farm with chickens and pigs. 27% are chickens and 39% are pigs. What is the probability that an animal chosen in random is either a chicken or a pig?

In a class of 29 students, 15 like Science and 21 like Math. They all like at least 1 of the two subjects. What is the probability that a student chosen in random likes Math or Science?