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WBJEE 2021 Math Solved Paper
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© examsnet.com
Question : 57
Total: 75
The co-efficient of
a
3
b
4
c
5
in the expansion of
(
b
c
+
c
a
+
a
b
)
8
is
12
!
3
!
4
!
5
!
6
!
3
!
33
3
.
(
6
!
3
!
3
!
)
Validate
Solution:
{
6
!
p
!
q
!
r
!
a
q
+
r
b
p
+
r
c
p
+
q
q
+
r
=
3
,
p
+
r
=
4
,
p
+
q
=
5
,
p
+
q
+
r
=
6
⇒
p
=
3
,
q
=
2
,
r
=
1
co-efficient
=
6
!
3
!
2
!
© examsnet.com
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