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Byju's Answer
Standard XII
Mathematics
Combination
Find the coef...
Question
Find the coefficient of
a
2
b
3
c
4
d
in the expansion of
(
a
−
b
−
c
+
d
)
10
be
k
. Find sum of digits of
|
k
|
?
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Solution
(
a
−
b
−
c
+
d
)
10
Coefficient of
(
a
)
r
1
×
(
b
)
r
2
×
(
c
)
r
3
×
(
d
)
r
4
is
10
!
r
1
!
.
r
2
!
.
r
3
!
.
r
4
!
1
r
1
(
−
1
)
r
2
(
−
1
)
r
3
(
1
)
r
4
=
10
!
(
−
1
)
3
(
−
1
)
4
2
!
×
3
!
×
4
!
×
1
!
=
−
12600
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Q.
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