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Problem
#WSP-000372
Problems
Methods
Mathematical induction
Problem
Show that if
1
+
2
+
⋯
+
n
=
n
(
n
+
1
)
2
, then
1
+
2
+
⋯
+
(
n
+
1
)
=
(
n
+
1
)
(
(
n
+
1
)
+
1
)
2
.
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