Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Please Solve R.D. Sharma class 12 Chapter 30 Probaility Exercise 30.5 Question 7 Maths Textbook Solution.

Please Solve R.D. Sharma class 12 Chapter 30 Probaility  Exercise 30.5 Question 7 Maths Textbook Solution.

Answers (1)

Answer:\frac{5}{22}

Hint: You must know the rules of finding probability.

Balls are drawn without replacement.

Given: Box contains (3White + 4Red + 5Black) balls

Solution: Box=(3W+4R+5B)

Total no. of balls = 3+ 4+ 5=12 balls

P(one white and one black)=P(first white, second black)+P(first black, second white)

\begin{aligned} &=\frac{3}{12} \times \frac{5}{11}+\frac{5}{12} \times \frac{3}{11} \\ &=\frac{15}{132}+\frac{15}{132} \\ &=\frac{30}{132} \\ &=\frac{5}{22} \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 Board exams twice a year from 2025, no plan for semesters: MoE
anam-khan

CBSE Class 12 board exams 2025 to have 50% competency-based questions; no change in 10th
anam-khan

CBSE Class 12 board exams 2024 over; expected result date, trends of last 10 years

Latest Question