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Byju's Answer
Standard XII
Mathematics
Combination with Restrictions
Different wor...
Question
Different words are being formed by arranging the letters of the word ARRANGE. All the words obtained are written in the form of dictionary
The number of ways in which the consonants occur in alphabetic order is
A
360
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B
105
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C
240
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D
None of these
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Solution
The correct option is
B
105
We write the consonants in alphabetic order:
G
N
R
R
We cannot arrange these.
There are 5 gaps where we need to place
A
A
E
i.e.
3
objects which can be done in
3
+
5
−
1
C
5
−
1
=
7
C
4
=
35
ways.
These may be arranged in
3
!
2
!
=
3
ways.
Thus, total =
35
×
3
=
105
ways.
Hence, (B) is correct.
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