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Binomial theorem
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(
a
+
b
)
n
=
(
n
0
)
a
n
b
0
+
(
n
1
)
a
n
−
1
b
1
+
(
n
2
)
a
n
−
2
b
2
+
.
.
.
+
(
n
n
−
1
)
a
b
n
−
1
+
(
n
n
)
a
0
b
n
(
a
+
b
)
n
=
∑
k
=
0
n
(
n
k
)
a
n
−
k
b
k
Coefficients
:
(
n
k
)
=
n
!
k
!
(
n
−
k
)
!
Keywords: Binomial theorem
Step-by-step by clicking
Played automatically
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Just the solution
What do I need to know?