: 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

In the summer of 1976, on an oak living room table in my parents’ house, a die did in fact not land on a any of its sides. I was playing Yahtzee with my nephews, when one of the dice landed on one of its edges!! None of us have never seen this happen again. How unlikely is this? I don’t know, but I’ve always considered the probability of rolling either one of 1 to 6 is EXTREMELY close to 1, but not 1.