Question
1 + 2 + 3 + ... + 12 = ?
Answer: Option D
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1
+
2
+
3
+
⋯
+
12
=
n
(
n
+
1
)
2
=
12
(
12
+
1
)
2
=
12
×
13
2
=
6
×
13
=
78
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