Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
teach
pricing
sign-in
Download our FREE mobile app with 1000+ tests for CBSE, JEE MAIN, AIPMT
X
Search
Topics
Want to ask us a question?
Click here
Browse Questions
Student Questions
Ad
Home
>>
JEEMAIN and AIPMT
>>
Mathematics
>>
Class11
>>
Permutations and Combinations
0
votes
20 identical marbles of green colour and 20 identical marbles of white colour can be arranged in a row in how many ways so that no two same colour marbles are adjacent?
$\begin{array}{1 1} (20 \!)^ 2 \\ 2.(20 \!)^2 \\ 2\\ 1\end{array}$
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
easy
Share
asked
Sep 5, 2013
by
rvidyagovindarajan_1
edited
Apr 1
by
meena.p
Please
log in
or
register
to add a comment.
Can you answer this question?
Do not ask me again to answer questions
Please
log in
or
register
to answer this question.
1 Answer
0
votes
Fix all the white marbles in one way (since the marbles are identical.)
Then fix all the green marbles in one way in between the white ones.
or
Fix all the green ones first and then fix the white ones in between the green ones.
in 1 way
$\therefore$ The required no. of arrangements = 1+1=2 ways.
answered
Sep 5, 2013
by
rvidyagovindarajan_1
Please
log in
or
register
to add a comment.
Related questions
0
votes
1
answer
There are $10$ white and $10$ black balls each set numbered 1,2,3......10. The no. of ways in which they can be arranged so that no two adjacent balls are of same colour is ?
asked
Sep 5, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
medium
0
votes
1
answer
There are 7 identical black balls and 4 identical white balls. In how many ways can they be arranged in a row so that no two white balls are adjacent?
asked
Sep 5, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
permutations
easy
0
votes
1
answer
There are 2 white 3 black and 4 red balls. The no. of ways in which these balls can be arranged so that no two red balls can be together is? (Two balls of same colour are identical.)
asked
Aug 31, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
combinations
medium
0
votes
1
answer
In how many ways 9 identical marbles can be placed in 3 identical boxes?
asked
Sep 3, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
medium
0
votes
1
answer
The no. of ways in which 20 different pearls of two colours can be set alternatively on a necklace, there being 10 pearls of each colour, is ?
asked
Sep 5, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
easy
0
votes
1
answer
In how many ways can 7 plus (+) signs and 4 minus (-) signs can be arranged in a row so that no two minus signs are together?
asked
Aug 20, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
combinations
easy
0
votes
1
answer
There are 4 balls of different colour and 4 boxes of colours, same as that of balls. The no. of ways in which the balls, one each in a box,could be placed such that a ball does not go to a box of its own colour is ?
asked
Aug 31, 2013
by
rvidyagovindarajan_1
jeemain
math
class11
ch7
permutations-and-combinations
fundamental-principle-of-counting
medium
Ask Question
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
AIPMT Crash Practice
5 Test Series
JEEMAIN
350+ TESTS
AIPMT
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
x
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...