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>>
JEEMAIN and NEET
>>
Mathematics
>>
Class12
>>
Determinants
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Q)
If
Δ
r
=
|
2
r
−
1
(
r
+
1
)
!
1
+
1
r
2
r
a
b
c
2
n
−
1
(
n
+
1
)
!
−
1
n
(
n
+
1
)
|
then value of
n
∑
r
=
1
Δ
r
is
(
A
)
0
(
B
)
(
n
+
3
)
!
(
C
)
a
(
n
!
)
+
b
(
D
)
None of these
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