Question

34. A bag contains 7green, 10 blue and 5 red balls. A ball is drawn at random. Find the probability of this ball
being a :
a. Blue ball
b. red ball or a green ball
c. not a green ball
SECTION - E
(Question numbers.35 to 40 carry 4 marks each)
35. Two water tapes together can fill a tank s. The tap of larger diameter takes 10 hours less than the
smaller one to fill the tank separately. Find the time in which each tap can separately fill the tank.
OR
ma class test, the sum of Shefali's, marks in Mathematics and English is 30. Had she got 2 marks more in Mathematics and 3 marks less in English, the product of their marks would have been 210. Find the
marks in the two subjects.
​

Answer 1

Step-by-step explanation:

34.) total outcome =7+10+5

=22

blue ball =10

a) probability of blue ball = no.of outcomes / total no.of outcomes

= 10/22 = 5/11

b) red or a green ball = 7+5 =12

probability of red or a green ball = 12/22

= 6/11

c) not a green ball = 22-7

= 15

probability of not a green ball = 15/22