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Byju's Answer
Standard VI
Mathematics
Idea of a Set
In how many...
Question
I
n
h
o
w
m
a
n
y
w
a
y
s
c
a
n
5
k
e
y
s
b
e
p
u
t
i
n
a
r
i
n
g
A
1
2
4
!
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B
1
2
5
!
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C
4
!
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D
5
!
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Solution
The correct option is
C
4
!
For the circular Permutations, it should be the
n
!
5
Since total no of keys is
5
so it is divided by
5
As the ring and turn up site down
So we have to divide
n
!
by
5
as clockwise cases are same as anticlockwise cases.
Thus we get,
5
!
5
=
4
!
This is the right answer.
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0
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