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33. Probability
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Q6 of 158 Page 33

What is the probability that an ordinary year has 53 Sundays?

given: an ordinary year which includes 52 weeks and one day

formula:


so, we have to determine the probability of that one day being Sunday


Total number of possible outcomes are 7


Therefore n(S)=7


E= {M, T, W, T, F, S, SU}


n(E)=1




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4

In a single throw of three dice, find the probability of getting a total of 17 or 18

5

Three coins are tossed together. Find the probability of getting:

(i) exactly two heads


(ii) at least two heads


(iii) at least one head and one tail

7

What is the probability that a leap year has 53 Sundays and 53 Mondays?

8

A bag contains 8 red and 5 white balls. Three balls are drawn at random. Find the probability that:

(i) All the three balls are white


(ii) All the three balls are red


(iii) One ball is red and two balls are white

Questions · 158
33. Probability
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