If in a random experiment, there are n mutually exclusive and equally likely elementary events
and m of them are favourable to an event A, then the probability p of happening of A, denoted by P(A),
is defined as the ratio (m/n).
The probability q of failure of event A is
Exhaustive events: The total number of possible outcomes of a random experiment is called exhaustive events.
(i) In tossing a coin, exhaustive events are two.
(ii)In throwing a die, the exhaustive number of cases is 6.
Mutually Exclusive: The events are said to be mutually exclusive if they can not occur simultaneously in a single draw.
When a coin is tossed, it can show either a head or a tail.
If we toss a Tail, we can not get a Head.
If we toss a Head, we can not get a Tail.
Thus these events are mutually exclusive.
Previous Years’ Board Questions on Probability (Baye’s Theorem)
have already been uploaded.
The link to the above Board Questions is given below.
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Probability (Addition and Multiplication Theorem ) 1
The addition rule:
When two events are mutually exclusive, we can work out
the probability of either of them occurring by adding together the separate probabilities.
Probability (Addition and Multiplication Theorems) 2Multiplication Theorem of Probability:
If two events A and B are independent, then
the probability that they will both occur
is equal to the product of their individual probabilities.
i.e., P(A and B) = P(A) ×P(B)
in set notation P(A∩B) = P(A)× P(B)
Probability (Addition and Multiplication Theorems) 3Probability of the occurrence of at least one of the several independent events of a random experiment:
then the probability that at least one of these events must happen is
Probability (Addition and Multiplication Theorems) 4 Probability (Addition and Multiplication Theorems) 5 Probability (Addition and Multiplication Theorem ) 6 Probability (Addition and Multiplication Theorem ) 7
Odds:
Probabilities are often expressed
in terms of ‘odds’.
Download ISC Board Questions On Probability(Addition and Multiplication Theorem) 
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Hi, is there way I can download the probability 12 ISC previous board questions file?
please provide download link for this article as examination are approaching i dont have much money to buy books so please make them available its my humble request
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