Restriction on p

[kenhung123]

When we solve for 'p' where p is like the probability of some event, I quite often get p=0,..,..,1 but how can we explain that the probability cannot equal to 0 or 1 as it satisfies when eliminating the alternatives 0 and 1

[98.40_for_sure]

. If the number of prob thingies is greater than 1, then