Probability of An Event


 
 
Concept Explanation
 

Probability of An Event

Probability: It predicts the chance of occuring an event.The value lies between 0 and 1. If an event is sure to happen then the probability will be 1 and if an event is impossible to happen then the the probabity of occurance is 0..

small Probability = frac{No ;of; favourable; Outcomes}{Total; number; of; events}

Example 1: We have balls number 1 to 9. What is the probability of picking an even numbered ball.

Sol: Total number of possible outcomes= 9 as there are 9 balls.

Total Number of favourable cases = 2,4,6,8 Numberd ball is picked. Therefore the number of favourable  cases is 4

small P(Even; Numbered; ball) = frac{4}{9}

Sample Questions
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Question : 1

In a bouquet, there 5 red roses, 6 white roses and 4 pink roses. Cheshtha picks up a rose without looking at it. The probability that its a red rose is

Right Option : B
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Explanation
Question : 2

In a box, there are 7 blue pens and 4 red pens. Ankit picks up a pen without looking at it. The probability that it is a red pen is

Right Option : A
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Explanation
Question : 3

In an election, there are 135 male candidates and 105 female candidates. The probability that a female candidate will win the election is

Right Option : D
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Explanation
 
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