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?
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One is the whole. 100%. It can’t be more or less. If you roll a standard 6 sided dice there is a 100% chance you’ll roll a number between 1 and 6.
Each probability is a number smaller than one. Let’s use a 20 sided dice because the math is easier for me. The chance of you rolling one of those numbers is 1/20. 1 divided by 20 equals 0.05. 0.05 = 5%. There is 20 possibilities, and you are dividing the number one by 20. 1 is all of the possible outcomes added together. In this instance 0.05 × 20 = 1.
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