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Find the value of
3
C
0
+
3
C
1
+
3
C
2
+
3
C
3
and
4
C
0
+
4
C
1
+
4
C
2
+
4
C
3
+
4
C
4
Prove, in general, that
∑
r
=
0
n
(
n
r
)
=
2
n
Consider the expansion of
(
1
+
1
)
n