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Probability · Question 68 of 70

Question 68

MediumOriginal question

Two dice are thrown. What is the probability of a doublet or a sum of 8?

\frac{5}{18}

Correct answerYour answer

\frac{11}{36}

Correct answerYour answer

\frac{1}{3}

Correct answerYour answer

\frac{13}{18}

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer A

Correct answer: A

Doublets: 6 outcomes. Sum 8: 5 outcomes. Both: $(4, 4)$ only.
$\frac{6 + 5 - 1}{36} = \frac{10}{36} = \frac{5}{18}$ .

Worth noting

$\frac{11}{36}$ counts $(4, 4)$ twice, once in each event.

Concept: The addition rule with dice
Typical timeTypical: 90 s
Your timeYours: —

The rule this testsThe addition and complement rules

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