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
(a) A two digit number
(b) A perfect square
(c) A number divisible by 5

Answer 1

a) 9/10
b) 1/10
c) 1/5
hope it helps!!!!!!!

Answer 2

Given; A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box

To Find; The probability

(a) A two-digit number

(b) A perfect square

(c) A number divisible by 5

Solution Total number of discs= 90

Number of two-digit numbers = 81

Number of perfect squares =9

Number of Divisible by 5 = 17

Probability of two-digit number = 81/90

Probability of two-digit number = 81/90Probability of perfect square =9/90

Probability of two-digit number = 81/90Probability of perfect square =9/90probability of number divisible by 5 = 17/90