Question

A box contains 90 balls numbered from 10 to 99. A ball is picked from the box. What is the probability of getting perfect square number?​

Answer 1

Step-by-step explanation:

Number of 2 digit numbers from 1 to 90=81.

P(2 digit number)=

90

81

=

10

9

ii) Number of perfect squares between 1 and 90=(1,4,9,16,25,36,49,64,81)=9

P(Perfect square)=

90

9

=

10

1

iii) Multiples of 5 are 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90

Number of multiples of 5=18

P(Multiples of 5)=

90

18

=

5

1

hope it helps