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JEEMAIN and NEET
>>
Mathematics
>>
Class11
>>
Permutations and Combinations
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Q)
There are
20
boxes numbered
1
,
2
,
.
.
.
.
.
.20
. Five boxes are selected at random and are arranged in ascending order. In how many ways this can be done so that no.
10
is present in each selection and it comes in
3
r
d
place in the arrangement.?
(
A
)
10
C
2
×
10
C
2
(
B
)
9
C
2
×
10
C
2
(
C
)
9
C
2
×
9
C
2
(
D
)
19
C
4
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