UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Take Class 12 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Class 12 Tuition > Learn Class XI-XII Tuition (PUC) > There are 4 letters and 4 addressed envelopes. find...
✕

Search in

There are 4 letters and 4 addressed envelopes. find the probability that all the letters are not dispatched in the right envelope.

Asked by Last Modified  

8 Answers

Learn Class XI-XII Tuition (PUC)

Follow 1
Answer

Please enter your answer

Maths and Physics teaching For XI, XII, IIT Jee Level , Quant and DI for CAT/GMATE/GRE aspirents

4! (1/2! - 1/3! +1/4! ) = 9
Comments
Dislike Bookmark

9
Comments
Dislike Bookmark

Tutor

Let the letter be designated as A,B,C,D and corresponding correct envelopes as 1,2,3,4. FOR EACH LETTER THERE ARE 3 CASES AND FOR EACH CASE 3 POSSIBILITIES. A2 B3 C4 D1 B4 C1 D3 B1 C4 D3 A3 B1 C4 D2 B4 C2 D1 B4 C1 D2 A4 B1 C2 D3 B3 C2 D1 B3 C1 D2 TOTAL...
read more
Let the letter be designated as A,B,C,D and corresponding correct envelopes as 1,2,3,4. FOR EACH LETTER THERE ARE 3 CASES AND FOR EACH CASE 3 POSSIBILITIES. A2 B3 C4 D1 B4 C1 D3 B1 C4 D3 A3 B1 C4 D2 B4 C2 D1 B4 C1 D2 A4 B1 C2 D3 B3 C2 D1 B3 C1 D2 TOTAL NINE CASES Thus probability that none are dispatched in their right envelopes = 9/24 = 3/8 read less
Comments
Dislike Bookmark

Mathematics for JEE Mains/Advanced, XI & XII (All Boards)

Derangement Principle
Comments
Dislike Bookmark

Enthusiastic and Subject Oriented approach in teaching

The simple direct formula for the envelopes problems is 1/e(for wrong distribution) and (1-1/e) (for atleast 1 enveloep being delivered into right cover)
Comments
Dislike Bookmark

Qualified and Experienced Tutor

Question of Dearrangement :)
Comments
Dislike Bookmark

AARAV Mathematics Classes

1 - (1/4!)=23/24
Comments
Dislike Bookmark

9
Comments
Dislike Bookmark

View 6 more Answers

Related Questions

What should be the charges per month for maths of 11 & 12 th CBSE at baroda.
For 11th 3000 n 12th 3500
Er Megha Pandey
0 0
9
__________ is a vector quantity. (Electric field, Electric Field Intensity, Electric charge, Electric current)
Electric Field
Narendra Kumar
0 0
8
The simple assumption that all possible reference frames moving with uniform velocity relative to one another are equivalent for the statement of laws of physics is called the __________. (Principle of Relativity, Uncertainity Principle, Pauli’s Exclusion Principle, None of these)
none of these
Narendra Kumar
0 0
6
Where do ultrahigh-energy particles come from?
Remanent supernovae and super-massive black-hole horizons are sources of ultrahigh energy particles
RAJ KUMAR S.
2 0
6
What is the value of sin 45+ cosec 45?
3?2 /2=2.1213
Shubham
0 0
7

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Learning tip
Life is a series of experiences, each one of which makes us bigger, even though sometimes it is hard to realize this. For the world was built to develop character, and we must learn that the setbacks and...

Khushboo Sah

1 0
0
Introduction To Accounting: Part 4: Accounting Cycle
Remember when we started learning English? We started off by learning Alphabets, then we joined Alphabets to form Words, then we joined Words to form Sentences, then we joined Sentences to form Paragraphs,...

Nishant Kumar

0 0
0
Square Of a Number Ending In 5
Let's say we want to get the square of 35 i,e 35 x 35, Take the first no ie 3,take the next number i,e 4, Multiply 3 and 4 ie 3 x 4 = 12, Place 25 after 12, So, the answer is 1225, Lets try some more, 75...

Sachidananda R.

0 0
0
For IIT/NEET Aspirants Class 12 Chemistry - Thermodynamics (Adiabatic Process).
In thermodynamics, an adiabatic process is the one that occurs without the transfer of heat or matter between a system and its surrrounding. Energy is only transfer as work. Lets try an example:

Nidhi T.

0 0
0
Atomic Structure
All substances are made from atoms. Each atom is made of a nucleus - containing protons and neutrons - surrounded by electrons. The atomic number is the number of protons in an atom. The elements are...

Tejas Academy Centre

1 0
0

Recommended Articles

Meet Sandhya R, a B.Sc tutor from Bangalore

Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...

Read full article >

Meet Radhe Shyam Burman, an MBA Tutor from...

Radhe Shyam is a highly skilled accounts and finance trainer with 8 years of experience in teaching. Accounting is challenging for many students and that’s where Radhe Shyam’s expertise comes into play. He helps his students not only in understanding the subject but also advises them on how to overcome the fear of accounts...

Read full article >

Meet Swati, a Hindi Tutor from Bangalore

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Meet Mohammad Wazid, a skilled trainer for...

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Find Class 12 Tuition near you
Class 12 Tuition in Delhi
Class 12 Tuition in Bangalore
Class 12 Tuition in Chennai
Class 12 Tuition in Hyderabad
Class 12 Tuition in Kolkata
Class 12 Tuition in Mumbai
Class 12 Tuition in Lucknow
Class 12 Tuition in Gurgaon
Class 12 Tuition in Noida
Class 12 Tuition in Pune
Online Tuition Class 12

Looking for Class 12 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Class 12 Tuition Classes?

The best tutors for Class 12 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 12 Tuition with the Best Tutors

The best Tutors for Class 12 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2025 All Rights Reserved