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Byju's Answer
Standard XII
Mathematics
Permutation under Restriction
In how many w...
Question
In how many ways can the letters of the word 'ALGEBRA' be arranged without changing the relative order of the vowels and consonants?
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Solution
Consider the problem
In the word
A
L
G
E
B
R
A
, there are three Vowels
(
A
,
A
a
n
d
E
)
and four Consonants
(
L
,
G
,
B
a
n
d
R
)
We need to find the different arrangements of the word
A
L
G
E
B
R
A
such that relative positions of Vowels and
Consonants do not change.
Therefore, in the three positions occupied by vowels, we can rearrange the vowels in
3
!
2
!
=
3
w
a
y
s
And, four consonants can be rearranged in four spaces occupied by consonants in
4
!
w
a
y
s
=
24
w
a
y
s
Therefore, required number of arrangements
=
3
×
24
=
72
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