: Why do all the probabilities add up to 1?

Question

When we roll a dice the probability of getting each number is (1/6). Apart from the fact that probabilities are supposed to be in the range of 0-1; why do they all add up to 1?

In: 3

Answer 1

The probability of something happening is 1. You just don’t know what it is yet. So the sum of all possible outcomes is 1