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15. Probability
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Q26 of 53 Page 15

Shoaid tosses two coins of denominations Re 1 and 2 simultaneously. What is the probability that he get at least one head?

Outcomes = (H,H), (H,T),(T,H),(T,T)


Atleast 1 head means that number of heads are one or more than 1.


Possible Outcomes = 3


P( that he get at least one head) =


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24

Five cards the ten, jack, queen, king and ace of diamonds, are well-shuffled with their face downwards. One card is then picked up at random.

(i) What is the probability that the card is the queen?


(ii) If the queen is drawn and put aside, what is the probability that the second card picked up is


(a) an ace? (b) a queen?

25

Find the probability of a non-leap year having 53 Sundays.

27

A box contains 19 balls bearing numbers 1,2,3,…., 19. A ball is drawn at random from the box. Find the probability that the number on the ball is

(i) a prime number


(ii) divisible by 3 or 5


(iii) neither divisible by 5 nor by 10


(iv) an even number

28

A bag contains 4 white ball, 6 red balls, 7 black balls and 3 blue balls. One ball is drawn at random from the bag. Find the probability that the ball drawn is

(i) white


(ii) not black


(iii) neither white nor black

Questions · 53
15. Probability
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