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What is the prabability if I roll a dice once and get: a.the face is odd or a three?   b.given that the face is odd, it is a one?

What is the prabability if I roll a dice once and get: a.the face is odd or a three?   b.given that the face is odd, it is a one?

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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What is the prabability if I roll a dice once and get:

a.the face is odd or a three?  

b.given that the face is odd, it is a one?

I know for a, odd number and 3 are non-exclusive so P(odd U 3) supposed to be P(odd)+P(3)-P(odd n 3)=7/12 

but this is not the right answer, why? 

Expert Solution
Step 1

If a dice is rolled, then the all-possible outcomes are 1, 2, 3, 4, 5, and 6.

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