true

Take Engineering Entrance Coaching from the Best Tutors

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

Search in

Derangements, Arrangement Of Things So That No Elements Appear In Their Original Place (Important for IITJEE)

Sujoy Das

31/01/2018 3 0

"Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts."

So number of ways:

D(n)=n!(1-1/1!+1/2!-1/3!+.....(-1)^n1/n!))

Where n is number of things which don't go to their original position
here in this question n = 5

So 5!*(1-1/1!+1/2!-1/3!+1/4!-1/5)) = 44 ways in which 5 tshirts won't go to their original position

D(1) = 0

D(2) = 1

D(3) = 2

D(4) = 9

D(5) = 44

D(6) = 265 (( remember these values of Dearangements )).

3 Like 0 Dislike

Follow 5

Other Lessons for You

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

Memorizing the Balance Sheet

Liability Side Soman Rocked Sajan Under Coconut Palm Soman - Share Capital Rocked - reserves & Surplus Sajan - Secured Loans Under - Un Secured Loans Coconut - Current Liabilities Palm - Provisions ...

Manish Gupta

0 0

Class 12- Partnership (Sacrificing Ratio).

Lesson Partnership Sacrificing Ratio At the time of admission of a Partner, the old partners will sacrifice from their profit sharing ratio. For example , a firm has two partners A and B who were sharing...

Dr. Abhijit Bose

0 0

Number Theory

In number theory, we deal only with integers and their properties. Many of you may have heard about this branch of mathematics but may not know much about it. Here I am going to introduce you to some of...

Shreyan Saha

0 0

Concept For IIT NEET: Trick To Find The Major Product Formed In The Reaction-Influence Of Addition Of Base And Thermal Conditions.

a) The first step to find the major product under the influence of base and thermal conditions is to first identify from where the bond has the maximum possibility to break owing to various factors: 1....

Nidhi T.

0 0

Find Engineering Entrance Coaching classes near you

Online Engineering Courses

Looking for Engineering Entrance Coaching classes?

Learn from Best Tutors on UrbanPro.

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you

Engineering Entrance Coaching Questions

How do I clear concepts of physics?

5 Answers

What is the best way to master physics?

5 Answers

For physics, is HC Verma good?

6 Answers

Looking for Engineering Entrance Coaching Classes?

The best tutors for Engineering Entrance Coaching Classes are on UrbanPro

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

Take Engineering Entrance Coaching with the Best Tutors

The best Tutors for Engineering Entrance Coaching Classes are on UrbanPro

I am a Student I am a Tutor
Name*	Please enter your full name. Please enter institute name.
Email*	Please enter your email address.
Phone*	Please enter a valid phone number.
Location*	Please enter a pincode or area name.
City*	Please enter city name.
Category*	Please enter category.
Gender*	Male Female Please select your gender.
Email ID/ Mobile No.*	Please enter either mobile no. or email.
Enter Password*	Please enter OTP Please enter Password Sorry, this phone number is not verified, Please login with your email Id.