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15. Probability
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Q15 of 25 Page 15

A number is selected at random from first 50 natural numbers. Find the probability that it is a multiple of 3 and 4.

Concept Used:



A multiple of 3 and 4 means that the number should be multiple of both.


So, we have to find multiple of 3 × 4 = 12.


Explanation:


Total Possible outcomes = 50


Total favourable outcomes = 12, 24, 36, 48


Number of favourable outcomes = 4



Hence, the probability of getting a multiple of 3 and 4 is 2/25.


More from this chapter

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13

A bag contains some red balls and some white balls. The probability of drawing a red ball is 1/4, and the total number of balls is 20. Find the number of red balls and white balls.

14

Suppose you drop a die at random on the rectangular region shown in Fig. 15.6. What is the probability that it will land inside the circle with diameter 1m?

16

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

(i) exactly two heads


(ii) at most two heads


(iii) at least one head and one tail.


(iv) no tails

17

Two customers are visiting a particular shop in the same week (Monday to Saturday). Each is equally likely to visit the shop on any one day as on other. What is the probability that both will visit the shop on:

(i) the same day?


(ii) different days?


(iii) consecutive days?

Questions · 25
15. Probability
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