UrbanPro
true

Take Class 12 Tuition from the Best Tutors

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

permutation and combination

Deepak Gupta
03/09/2018 0 0

QUESTION:There are 12 intermediate stations between two places A and B. Find the number of ways in which a train can be made to stop at 4 of these intermediate stations so that no two stopping stations are consecutive?

ANSWER: 126

EXPANATION:Initially, let's remove the 4 stopping stations 

Then we are left with 8 non-stopping stations (=12-4)

Now there are 9 positions  to place the 4 stopping stations

such that no two stopping stations are consecutive

This can be done in   9C4 ways

Hence, required number of way= 9C4 =126

0 Dislike
Follow 1

Please Enter a comment

Submit

Other Lessons for You


Quick Revision Strategy
With exam season fast-approaching, it’s essential to start thinking about managing, planning, and effectively utilising your time. Revision plays a vital role in scoring good in your examination....

How To Prepare For CBSE Class 12 Board Exam ?
How to prepare for the CBSE Class 12 Board Exam? In this lesson, I will teach you how to prepare for the CBSE Class 12 Board Exam. Your class 12 board exam is probably the most important exam in your...
A

Abraham Paul

3 0
0

Integration CALCULUS
Integration is the operation of calculating the area between the curve of a function and the x-axis. Integral also includes antiderivative and primitive. Integration works by transforming a function into another function respectively.

Economic and Non Economic Activities - Class 9 | Class 11
ICSE Std IX Types of Human Activities - Business Studies, Commercial Studies
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