Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 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
15 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
tutors
pricing
login
X
ASK
Home
>>
JEEMAIN and NEET
>>
Mathematics
>>
Class11
>>
Permutations and Combinations
A coin is tossed 6 times In how many ways we can get the $3^{rd} $ head in the $5^{th}$ toss?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
medium
Share
asked
Sep 3, 2013
by
rvidyagovindarajan_1
edited
Aug 5, 2014
by
sharmaaparna1
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1 Answer
$5^{th}$ toss is head(H).
First 4 tosses can be 2 heads (H) and 2 tails(T). and
$6^{th}$ toss can be head or tail (2 ways)
This can be got in $\large\frac{4!}{2!.2!}$$\times 2$ ways.
$=12\: ways$
answered
Sep 3, 2013
by
rvidyagovindarajan_1
Please
log in
or
register
to add a comment.
Related questions
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?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
easy
asked
Sep 5, 2013
by
rvidyagovindarajan_1
1
answer
In how many ways can 3 girls and 9 boys can be seated in two vans having 3 numbered seats in the front and 4 numbered seats at the back so that the 3 girls are to be seated together in the back row?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
difficult
asked
Aug 20, 2013
by
rvidyagovindarajan_1
1
answer
The no. of ways in which 6 persons can be seated in a circular table so that two particular persons are never together is?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
medium
asked
Aug 13, 2013
by
rvidyagovindarajan_1
1
answer
The no. of ways in which 6 men and 5 women can sit at a round table so that no two women sit together is?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
easy
asked
Aug 13, 2013
by
rvidyagovindarajan_1
1
answer
Ten persons are to speak in a meeting. The no. of ways in which this can be arranged if A wants to speak before B and B wants to speak before C, is ?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
medium
asked
Aug 27, 2013
by
rvidyagovindarajan_1
1
answer
The no. of ways in which 8 different flowers can be strung to form a garland so that 4 particular flowers are not separated is?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
easy
asked
Sep 4, 2013
by
rvidyagovindarajan_1
1
answer
The no. of ways in which 10 students $A_1,A_2,.....A_{10}$ can be ranked so that $A_1$ is above $A_2$ is ?
jeemain
math
class11
ch7
permutations-and-combinations
permutations
easy
asked
Sep 3, 2013
by
rvidyagovindarajan_1
1
answer
Ask Question
Tag:
Math
Phy
Chem
Bio
Other
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
JEEMAIN
350+ TESTS
NEET
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
...