GATE CSE
First time here? Checkout the FAQ!
x
+2 votes
21 views
3 boys and 4 girls have to sit in a row with all arrangements equally likely. What is the probability that no 2 boys sit next to each other

a)1/7  b)2/7  c) 3/7  d)4/7
asked in Combinatory by Veteran (46.9k points) 61 295 639 | 21 views

Total cases of filling 7 seats = 7! 

Now Place 4 girls first = 4! ways _ G1_G2_G3_G4_

Now we have 5 position  and 3 boys = 5p

So probability = (5p ) 4!  / 7! = 2/7

Please log in or register to answer this question.



Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true
Top Users Oct 2017
  1. Arjun

    23386 Points

  2. Bikram

    17068 Points

  3. Habibkhan

    8158 Points

  4. srestha

    6286 Points

  5. Debashish Deka

    5438 Points

  6. jothee

    4978 Points

  7. Sachin Mittal 1

    4772 Points

  8. joshi_nitish

    4344 Points

  9. sushmita

    3964 Points

  10. Rishi yadav

    3804 Points


Recent Badges

Ancestor Arijit 2
Good Answer pC
Revival pC
Reader Rajesh R
Reader #Rahul
Popular Question Arnabi
100 Club Rahul68
Popular Question Kanchan kumari
Old-Timer Santanu
Devoted Reader smsubham
27,316 questions
35,170 answers
84,073 comments
33,262 users