Suppose that I have general information (probabilities) for how many yards a football player will run on the football field.
Let $A$ be the event the runner goes 1 yards, $B$ the event the runner goes 2 yards, $C$ the event the runner goes 3 yards and $D$ the event the runner goes 4 yards.
Let $()=0.60$, $()=0.20$, $()=0.1$ and $P(D)=0.1$.
Now, let's assume the runner is actually only 2 yards away from the end zone and so the player cannot exceed 2 yards which means $P(C)$ and $P(D)$ cannot happen.
Also, if the player has gone 2 yards, that means that they went 1 yard, and if they player went 3 yards they also went 1 & 2 yards, etc.
My question is, in this scenario, how can $P(A), P(B)$ be updated to reflect this information?