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Byju's Answer
Standard VII
Mathematics
Permutation under Restriction
There are 3...
Question
There are
3
girls &
5
boys. In how many way they can be arranged so that each girl does not sit with another girl.
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Solution
Let arrange five boys first
x
B
x
B
x
B
x
B
x
B
x
we have total six groups when girls can sit but we have to select
3
6
C
3
×
5
!
×
3
!
↑
↑
↑
s
e
l
e
c
t
i
o
n
o
f
p
l
a
c
e
f
o
r
g
i
r
l
s
A
r
r
a
n
g
e
m
e
n
t
o
f
b
o
y
s
A
r
r
a
n
g
e
m
e
n
t
o
f
g
i
r
l
s
6
×
5
×
4
3
!
×
5
!
×
3
!
=
14400
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