Math Problem Statement

Determine the probability when two dice are rolled: (4) The sum of the dice equals 7. (5) The difference of the dice equals 3.

Solution

The text in the image is in Indonesian and translates to the following:

"3. Two dice are thrown simultaneously. Determine the probability of: (4) The sum of the dice equals 7 (5) The difference of the dice equals 3"

Let's solve these:

(4) Probability that the sum equals 7:

When two six-sided dice (with faces numbered 1 to 6) are rolled, the possible sums range from 2 to 12. The total number of outcomes when rolling two dice is 6×6=366 \times 6 = 36.

The pairs that give a sum of 7 are:

  • (1, 6)
  • (2, 5)
  • (3, 4)
  • (4, 3)
  • (5, 2)
  • (6, 1)

There are 6 outcomes that give a sum of 7. Hence, the probability is: P(sum=7)=636=16P(\text{sum} = 7) = \frac{6}{36} = \frac{1}{6}

(5) Probability that the difference equals 3:

The difference between two dice results can be 3 in the following cases:

  • (1, 4)
  • (2, 5)
  • (3, 6)
  • (4, 1)
  • (5, 2)
  • (6, 3)

There are also 6 outcomes that result in a difference of 3. Thus, the probability is: P(difference=3)=636=16P(\text{difference} = 3) = \frac{6}{36} = \frac{1}{6}

Would you like a more detailed explanation or have any additional questions?

Related Questions:

  1. What is the probability of getting a sum of 8 when rolling two dice?
  2. How do you calculate the probability of rolling doubles (same number on both dice)?
  3. What is the probability of getting a sum less than 5 with two dice?
  4. If three dice are rolled, what is the probability that the sum equals 10?
  5. How do the probabilities change if a die is biased (loaded)?

Tip:

When calculating probabilities with dice, always remember to count all possible outcomes, which for two fair six-sided dice is 36. This helps in determining the probability accurately.

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Math Problem Analysis

Mathematical Concepts

Probability
Combinatorics

Formulas

P(event) = Number of favorable outcomes / Total number of possible outcomes
Total number of outcomes for two dice = 6 × 6 = 36

Theorems

Basic Probability Theorem

Suitable Grade Level

Grades 6-8