First slide

Theorems of probability

Question

On a toss of two dice, A throws a total of 5. Then the probability that he will throw another 5 before he throws 7 is

Easy

A

$\frac{2}{45}$
B

$\frac{2}{5}$
C

$\frac{1}{81}$
D

$\frac{1}{9}$

Solution

$p = \frac{1}{3}, q = \frac{2}{3}$
$P (E) = q p + q^{3} p + ..........$

= $\frac{q p}{1 - q^{2}}$

= $\frac{2}{5}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App