Check whether following probabilities P(A) and P(B) are consistently defined P ( A )=0.5 , P (

English

Gujarati

Hindi

14.Probability

easy

Check whether the following probabilities $P(A)$ and $P(B)$ are consistently defined $P ( A )=0.5$, $ P ( B )=0.4$, $P ( A \cap B )=0.8$

Option A

Option B

Option C

Option D

Solution

$P ( A )=0.5$, $P ( B )=0.4$, $P (A \cup B)=0.8$

It is known that if $E$ and $F$ are two events such that $E \subset F,$ then $P ( E ) \leq P ( F )$

Here, it is seen that $P (A \cup B)> P ( A )$ and $P (A \cup B)> P ( B )$

Hence, $P(A)$ and $P(B)$ are consistently defined.

Standard 11

Mathematics

Share

Similar Questions

A bag contains $9$ discs of which $4$ are red, $3$ are blue and $2$ are yellow. The discs are similar in shape and size. A disc is drawn at random from the bag. Calculate the probability that it will be either red or blue.

medium

The chances to fail in Physics are $20\%$ and the chances to fail in Mathematics are $10\%$. What are the chances to fail in at least one subject ………… $\%$

medium

Events $\mathrm{A}$ and $\mathrm{B}$ are such that $\mathrm{P}(\mathrm{A})=\frac{1}{2}, \mathrm{P}(\mathrm{B})=\frac{7}{12}$ and $\mathrm{P}$ $($ not $ \mathrm{A}$ or not $\mathrm{B})=\frac{1}{4} .$ State whether $\mathrm{A}$ and $\mathrm{B}$ are independent?

medium

Given two mutually exclusive events $A$ and $B$ such that $P(A) = 0.45$ and $P(B) = 0.35,$ then $P (A$ or $B ) =$

easy

Two dice are thrown simultaneously. The probability that sum is odd or less than $7$ or both, is

medium