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## Homework Statement

Two tetrahedral dice (four-sided dice) are thrown. What is the probability that the sum of the scores is:

a) even

b) prime

c) even or prime?

## Homework Equations

## The Attempt at a Solution

a) P(even) = 1/2

b) P(prime) = 9/16

c) c for confused

Can someone please explain the theory behind answering Question c?

Cheers.