Question

A person rolls a 10-sided die once. What are the odds that the number rolled is not greater than or equal to 5? Write your answer as a ratio, such as 1:2, and reduce as much as possible.

Answer 1

Its 2:3 from the sample answer

Explanation:

Answer 2

The Solution:

Given:

`10-sided\text{ die}=\lbrace1,2,3,4,5,6,7,8,9,10\rbrace=10`

The number rolled is not greater than or equal to 5.

That is,

`\lbrace1,2,3,4\rbrace=4`

The required odds in ratio form is:

`4:10=2:5`

Therefore, the correct answer is: 2 : 5