Question

A box contains 90 discs which are numbered 1-90. If one disc is drawn at random from the box, find the probability that it bears

(1) a two digit number
(2) nimber divisible by 5​

Answer 1

Answer:

(1)9/10

(2)1/5

Step-by-step explanation:

Total no. of disc=90

(1) no. if two digit no. disc.=81

P( two digit number)=no. of two digit numbered disc/total no. of disc

=81/90

=9/10

(2) total no. of numbers divisible by 5=18

P(getting a discof no. divisible by 5)=total no. of numbers divisible by 5/total no. of disc

=18/90

=1/5