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15. Probability
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Q11 of 53 Page 15

Find the probability that a number selected from the numbers 1 to 25 is not a prime number when each of the given numbers is equally likely to be selected.

Outcomes= 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25


Prime Numbers = 2,3,5,7,11,13,17,19,23


Let x be the event of getting prime numbers


P(x)=


Therefore the probability of getting non-prime number =


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9

In a throw of a fair die, find the probability of getting

(i) the number 5


(ii) the number 3 or 4


(iii) a prime number


(iv) a number greater than 4


(v) a number greater than 6


(vi) a number less than 6

10

A bag contains blue coloured balls only. Rahul takes out one ball without looking into the bag. What is the probability of his

(i) taking out a green ball?


(ii) taking out a blue ball?

12

A box contains 20 cards, numbered from 1 to 20. A card is drawn from the box at random. Find the probability that the number on the card drawn is (i) even (ii) prime and (iii) multiple of 3

13

The numbers on the six faces of a die are replaced by the letters given below:


In the throw of this die, find the probability of getting


(i) A (ii) B

Questions · 53
15. Probability
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