Q50 of 128 Page 13

Cards marked with numbers 13, 14, 15, …, 60 are placed in a box and mixed thoroughly. One card is drawn at random from the box. Find the probability that number on the card drawn is

(i) divisible by 5


(ii) a number is a perfect square

Total number of possible outcomes, n(S) = 48

(i) Number of favorable outcomes, n(E) = 10



(ii) Number of favorable outcomes, n(E) = 4



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48

Harpreet tosses two different coins simultaneously (say, one is of Re 1 and other of Rs 2). What is the probability that he gets at least one head?

 49

Two dice, one blue and one grey, are thrown at the same time. Complete the following table:


































Events:



2



3



4



5



6



7



8



9



10



11



12



Sum on two dice'



Probability



From the above table a student argues that there are 11 possible outcomes 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Therefore, each of them has a probability . Do you agree with this argument?

 51

A bag contains 6 red balls and some blue balls. If the probability of drawing a blue ball from the bag is twice that of a red ball, find the number of blue balls in the bag.

 52

A bag contains tickets numbered 11, 12, 13, …, 30. A tickedt is taken out from the bag at random. Find the probability that the number on the drawn ticket (i) is a multiple of 7

(ii) is greater than 15 and a multiple of 5.