Select Board & Class



  • Complementary events

For an event E such that of an experiment, the event  represents ‘not E’ , which is called the complement of the event E. We say, E and are complementary events.



A pair of dice is thrown once. Find the probability of getting a different number on each die.


When a pair of dice is thrown, the possible outcomes of the experiment can be listed as:



The number of all possible outcomes = 6 × 6 = 36

Let E be the event of getting the same number on each die.

Then,is the event of getting different numbers on each die.


Now, the number of outcomes favourable to E is 6.


Thus, the required probability is .

  • Algebra of events
    • Complementary event: For every event A, there corresponds another event A' called the complementary event to A. It is also called the event ‘not A’.

A' = {} =…

To view the complete topic, please

What are you looking for?