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Two fair six-sided dice (one red and one blue) are rolled, and the sum of the numbers on their top faces is recorded, as shown in this example:

1 + 2 = 3

Define the random variable

S

to model this situation.
Choose the one correct answer:

The random variable

S

represents the difference between the numbers on the two dice:

S (i, j) = | i - j |

,
The random variable

S

represents the product of the numbers on the two dice:

S (i, j) = i \times j

,
The random variable

S

represents the sum of the numbers on the two dice:

S (i, j) = i + j

.