[AntonioLao]

Originally Posted by Mohan.C How can the ratio of two null sets be something.

In the theory of probability, the concept of set is used to describe all possible outcomes. So, a null set would be used to indicate a sample space of zero probability of no outcome.

[Mohan.C]

The ratio of two sets is taken to find the probability of outcomes on functions related to these two sets. But the set of 0\0 is an infinite set.

[AntonioLao]

Originally Posted by Mohan.C But the set of 0\0 is an infinite set

The ratio of a set to itself is just absolute certainty of 1.