In library there are 2n+1 books if a student select at least n+1 books in 256 ways how many number of books in a library?

Asked by Last Modified  

8 Answers

Follow 0
Answer

Please enter your answer

There are 9 books
Comments
Dislike Bookmark

Maths Tutor

9 books
Comments
Dislike Bookmark

Trainer

4
Comments
Dislike Bookmark

MSc Chemistry , NET qualified

There are 9 Books.
Comments
Dislike Bookmark

Brain Trainer

9 books
Comments
Dislike Bookmark

Math Professional Tutor with 16 Years experience

Given that C(2n+1, n+1) + C(2n+1, n+2) + C(2n+1, n+3) +........+ C(2n+1, 2n+1) = 256 --------- (1) => C(2n+1, n) + C(2n+1, n-1) + C(2n+1, n-2) +........+ C(2n+1, 0) = 256 --------- (2) By adding (1) & (2), we get 2^(2n+1) = 512=2^9 => 2n+1 = 9 There fore total number...
read more
Given that C(2n+1, n+1) + C(2n+1, n+2) + C(2n+1, n+3) +........+ C(2n+1, 2n+1) = 256 --------- (1) => C(2n+1, n) + C(2n+1, n-1) + C(2n+1, n-2) +........+ C(2n+1, 0) = 256 --------- (2) By adding (1) & (2), we get 2^(2n+1) = 512=2^9 => 2n+1 = 9 There fore total number of books in the Library = 9. read less
Comments
Dislike Bookmark

Math Professional Tutor with 16 Years experience

Given that C(2n+1, n+1) + C(2n+1, n+2) + C(2n+1, n+3) +........+ C(2n+1, 2n+1) = 256 --------- (1) => C(2n+1, n) + C(2n+1, n-1) + C(2n+1, n-2) +........+ C(2n+1, 0) = 256 ------- (2) By adding (1) & (2), we get 2^(2n+1) = 512=2^9 => 2n+1 = 9 There fore total number...
read more
Given that C(2n+1, n+1) + C(2n+1, n+2) + C(2n+1, n+3) +........+ C(2n+1, 2n+1) = 256 --------- (1) => C(2n+1, n) + C(2n+1, n-1) + C(2n+1, n-2) +........+ C(2n+1, 0) = 256 ------- (2) [Since C(n, r) = C(n, n-r)] By adding (1) & (2), we get 2^(2n+1) = 512=2^9 => 2n+1 = 9 There fore total number of books in the Library = 9. read less
Comments
Dislike Bookmark

There fore total number of books in the Library = 9.
Comments
Dislike Bookmark

View 6 more Answers

Related Questions

Hi, I want to teach online accounts mainly to Class 11, 12 and B.Com students, but I don't have notes, so is it necessary to have notes or how can I develop them, request you to help me regarding this.
Hi Piyush, in online teaching you have to be systematic and very clear in whatever topic you are targeting and for that you should go point vice, so at least you prepare that piont in your mind before starting your online teaching.
Piyush
Out of 12 consonants and 4 vowels, how many words of 6 consonants and 3 vowels can be formed?
Plz check out the attachment
Veena
A gas exerts pressure on the walls of the containing vessel because __________. (It possesses momentum, the gas molecules collide with each other, the gas has finite volume)
It possesses momentum
Narendra Kumar
Can you find general solution of this equation dy/dx= (1+cosx)/(1-cosx).
int y *dy = int (1+cosx)/(1-cosx) *dx int y *dy= int ( 2 cos^2 x/2) / (2 sin^2 x/2) *dx int y *dy= int (cos^x/2) / (sin^2 x/2) * dx int y *dy= int (cot^2 x/2) * dx y = - (cosec ^ 2 x/2 ) / (1/2) +c y = -2 cosec ^2 x/2 ) +c
KM M Chary
The equation of a current is given by i = Imsin2?t. The frequency of the current in Hz is a.) ? ? 2?. b.) ? ? 2. c.) 2? ? ?. d.) ? ? ?.
Kindly re-post the question without the question mark symbols.
Kumar Upendra Akshay
0 0
View Comments6

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

Ask a Question

Related Lessons

Worksheet For Alcohols, Phenols And Ethers
Worksheet Alcohols, Phenols And Ethers: 1. Give the structure of 1,2-dimethoxy methane and 2-ethoxy-1,1-dimethylcyclohexane. (1m) 2. Give the name of alkyl halide and sodium alkoxide used to synthesis...

Ameer Khan

0 0
View Comments0
Its only about happiness.
Do more no of problems on each topic ,so that you can go ahead confidently. Get familiar with practical aspects of what you are going through.

Priyabrata Biswal

0 0
View Comments0
Steps For Solving A Sum On Admission Of A Partner
Admission of a Partner is a critical chapter of your syllabus. It involves appling few of the prominent concepts of Partnership Accounts and present the New Balance sheet of the Firm afer a New partner...

Madhura Sagar G.

0 0
View Comments0
Introduction To Partnership Firms
Fundamentals of partnership: A partnership comes into existence by an agreement. This agreement can be verbal or written. When two or more individuals enter into a partnership and sign a written agreement...

Srishti Agrawal

1 0
View Comments0
Internet of Things, Social Media Becoming Part of E-Discovery Landscape
The days when e-discovery consisted of handing over copies of e-mails to address Freedom of Information Act (FOIA) requests, compliance regulations or other legal obligations are over. Now, it's just as...

Rajesh N V

3 0
View Comments1

Recommended Articles

Meet Raghunandan.G.H, a B. Tech Tutor from...

Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...

Read full article >

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 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 Hyderabad
Class 12 Tuition in Chennai
Class 12 Tuition in Mumbai
Class 12 Tuition in Kolkata
Class 12 Tuition in Pune
Class 12 Tuition in Jaipur
Class 12 Tuition in Noida
Class 12 Tuition in Lucknow
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