Question

A book contain 85 pages .A page is chossen at random .What is the probability that the sum of the digit on the page is 8

Answer 1

the pages with the no. having sum of the digits as 8 are 8,17,26,35,44,53,62,71,80
total no. of pages = 85
no. of pages having sum of the digits as 8 = 9
now
probability that the sum of the digits on the page is 8 = 9/85

hope this helps:p

Answer 2

Look at the numbers from 1 to 85 whose digits sum to 8.
8,17,26,35,44,53,62,71,80
There are 9 of them. There are 85 total.
So, p= 9/85
         =0.105882352941
         =0.1