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Mathematics
Mathematics
Problem
Find the sum of the first 12 terms of: a.
3
+
9
+
15
+
21
+
…
3 + 9 + 15 + 21 + \dots
3
+
9
+
15
+
21
+
…
b.
24
+
12
+
6
+
3
+
…
24 + 12 + 6 + 3 + \dots
24
+
12
+
6
+
3
+
…
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