A fair coin and an unbiased die are tossed. Let $A$ be the event ' head appears on the coin' and $B$ be the event ' $3$ on the die'. Check whether $A$ and $B$ are independent events or not.

Vedclass pdf generator app on play store
Vedclass iOS app on app store

If a fair coin and an unbiased die are tossed, then the sample space $S$ is given by,

$S=\left\{\begin{array}{l}(H, 1),(H, 2),(H, 3),(H, 4),(H, 5),(H, 6) \\ (T, 1),(T, 2),(T, 3),(T, 4),(T, 5),(T, 6)\end{array}\right\}$

Let $A:$ Head appears on the coin

$A=\{(H, 1),(H, 2),(H, 3),(H, 4),(H, 5),(H, 6)\}$

$\Rightarrow $ $P(A)=\frac{6}{12}=\frac{1}{2}$

$\mathrm{B}: 3$ on die $=\{(\mathrm{H}, 3),(\mathrm{T}, 3)\}$

$P(B)=\frac{2}{12}=\frac{1}{6}$

$\therefore $ $A \cap B=\{(H, 3)\}$

$P(A \cap B)=\frac{1}{12}$

$P(A)\, P(B)=\frac{1}{2} \times \frac{1}{6}=P(A \cap B)$

Therefore, $A$ and $B$ are independent events.

Similar Questions

The probability of happening at least one of the events $A$ and $B$ is $0.6$. If the events $A$ and $B$ happens simultaneously with the probability $0.2$, then $P\,(\bar A) + P\,(\bar B) = $

  • [IIT 1987]

Three persons $P, Q$ and $R$ independently try to hit a target . If the probabilities of their hitting the target are $\frac{3}{4},\frac{1}{2}$ and $\frac{5}{8}$ respectively, then the probability that the target is hit by $P$ or $Q$ but not by $R$ is

  • [JEE MAIN 2013]

If the odds against an event be $2 : 3$, then the probability of its occurrence is

The probabilities that a student passes in Mathematics, Physics and Chemistry are $m, p$ and $c$ respectively. On these subjects, the student has a $75\%$ chance of passing in at least one, a $50\%$ chance of passing in at least two and a $40\%$ chance of passing in exactly two. Which of the following relations are true

  • [IIT 1999]

The odds against a certain event is $5 : 2$ and the odds in favour of another event is $6 : 5$. If both the events are independent, then the probability that at least one of the events will happen is