Question

A box contains 90 discs which are numbered from 1 to 90.If one disc is drawn at random from the box,find the probability that it bears (1)a two digit numbers (2)a perfect square number (3)a number divisible by 5​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

1).  9/10  2).  1/10    3). 1/5

Step-by-step explanation:

1)               fav. outcome = 81 {no. 10 to no. 90}

P(a 2 digit no.) = 81 / 90  = 9/10

2)               fav. outcome = 9 {1,4,9,16,25,36,49,64,81}

P (a perfect square) = 9/90 = 1/10

3)                 fav outcome = 18                                                                                                                                                      { 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90}

    P (no. divisible by 5) = 18 / 90 =  1 / 5