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You roll a 6-sided die two times.What is the probability of rolling a 1 and then rolling a 2?

解答

You roll a 6-sided die two times.What is the probability of rolling a 1 and then rolling a 2?

解答

\frac{1}{36}

求解步骤

Find the probability of rolling a 1:

\frac{1}{6}

Find the probability of then rolling a 2:

\frac{1}{6}

Since the events are independent, Use the formula

P (X_{1} \land X_{2} \land \dots \land X_{k}) = P (X_{1}) \cdot P (X_{2}) \cdot \dots \cdot P (X_{k})

= \frac{1}{6} \cdot \frac{1}{6}

\frac{1}{6} \cdot \frac{1}{6} = \frac{1}{36}

= \frac{1}{36}

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