Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Need Solution for R.D.Sharma Maths Class 12 Chapter 30 Probability Exercise 30.5 Question 30 Sub Question 2 Maths Textbook Solution.

Need Solution for R.D.Sharma Maths Class 12 Chapter 30 Probability  Exercise 30.5 Question 30 Sub Question 2 Maths Textbook Solution.

Answers (1)

Answer: \frac{2}{7}

Hint: You must know the rules of finding probability functions.

Given:

P\left ( Fatima\: gets\: selected \right )=\frac{1}{7}=P\left ( A \right )

P\left (John\: gets\: selected \right )=\frac{1}{5}=P\left ( B \right )

Solution:

P\left (only\:one\: of\: them gets\: selected \right )=P\left ( A \right )\times P\left ( \bar{B} \right )+P\left ( \bar{A} \right )\times P\left ( B \right )

\begin{aligned} &=\frac{1}{7}\left(1-\frac{1}{5}\right)+\left(1-\frac{1}{7}\right) \frac{1}{5} \\\\ &=\frac{1}{7} \times \frac{4}{5}+\frac{6}{7} \times \frac{1}{5} \\\\ &=\frac{4}{35}+\frac{6}{35} \\\\ &=\frac{10}{35}=\frac{2}{7} \end{aligned}

Posted by

infoexpert21

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE introduces CCTV policy in board exams 2025; schools fixed as centres must have facility
anam-khan

CBSE gives parents, schools till October 16 to register students in Classes 9, 11
anam-khan

CBSE Board Exam 2025: Class 9, 11 registration begins today; fee details, guidelines

Latest Question