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شائع Word Problems >

if you roll a dice twice what is the probability of rolling a 1 the first time and 2 the second time

الحلّ

i f yo u ro ll a d i ce tw i ce w ha t i s t h e p ro babi l i t y o f ro ll in g a 1 t h e f i rs t t im e an d 2 t h e seco n d t im e

الحلّ

\frac{1}{36}

+1

عشري

0.02777 \dots

خطوات الحلّ

Find the probability of rolling a 1 the first time:

\frac{1}{6}

Find the probability of 2 the second time:

\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}

أمثلة شائعة

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