Question

One page is randomly selected from a book containing 100 pages. The probability that the sum of the digits of the page number of the selected page is 9, is ______.

Options

• `1/10`

• `9/100`

• `11/100`

• `1/100`

Answer 1

One page is randomly selected from a book containing 100 pages. The probability that the sum of the digits of the page number of the selected page is 9, is `1/10`.

Explanation:

Favourable ways

= {9, 90, 18, 81, 27, 72, 36, 63, 54, 45}

Hence, required probability = `10/100 = 1/10`