maths boards

No they wont ask u striaght definations..but they can ask u questions based on those definations...
btw ..u can see the sample papers and previous years papers...that will give u a better idea abt the questions asked in probability

Probability mein maximum you get binomial distributions, independent and dependent events and Bayes theorem as per the papers I've done...
They could ask you application based questions, for eg, what is the value of P(A' and B') when some value is given. Knowledge of Venn diagrams is useful in this case if you do not remember the formulae.