Question

An number is chosen between 0 and 100. What is the probability of getting not divisible by 9?

Answer 1

multiples of 9 between 0 to 100 = 9, 18, 27, 36 , 45 , 54, 63 , 72, 81 , 90, 99
there are a total of 11 numbers divisible by 9 between 0 to 100.
probability of getting a number divisible by 9 = 11/100

probability of getting number not divisible by 9 = 1 - 11/100
= 100/100 - 11/100
= 89/100

∴ p(getting a number not divisible by 9) = 89/100

Answer 2

probablity = 89/100
No bw 0-100 that are not divisible by 9 = 100-11=89 .
and, total no. are= 100 .
so, probability = 89/100.
hope It will help you