Question
13 + 23 + 33 + ... + 63 = ?
Answer: Option B
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1
3
+
2
3
+
3
3
+
⋯
+
6
3
=
n
(
n
+
1
)
2
2
=
6
(
7
)
2
2
=
3
×
7
2
=
21
2
=
441
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