Question

8. An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that

the ball was drawn is white.


9. A dice is thrown. Find the probability of getting:

i. a prime number

ii. 2 or 4

iii. a multiple of 2 or 3.​

Answer 1

Step-by-step explanation:

8. 8/18

9.i)3/6

ii)2/6

iii)2/6

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Answer 2

8-Given: A bag contains 10 red and 8 white balls

Required to find: Probability that one ball is drawn at random and getting a white ball

Total number of balls 10 + 8 = 18

Total number of white balls is 8

We know that, Probability = Number of favourable outcomes/ Total number of outcomes

Thus, the probability of drawing a white ball from the urn is 8/18 = 4/9

9-(i) Prime numbers on a dice are 2, 3, and 5. So, the total number of prime numbers is 3.

We know that, Probability = Number of favourable outcomes/ Total number of outcomes

Thus, probability of getting a prime number = 3/6= 1/2

(ii) For getting 2 and 4, clearly the number of favourable outcomes is 2.

We know that Probability = Number of favourable outcomes/ Total number of outcomes

Thus, the probability of getting 2 or 4 = 2/6=1/3

(iii) Multiple of 2 are 3 are 2, 3, 4 and 6. So, the number of favourable outcomes is 4

We know that, Probability = Number of favourable outcomes/ Total number of outcomes

Thus, the probability of getting an multiple of 2 or 3 = 4/6 = 2/3