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Use the Partial Sum Formula to Find the Partial Sum 9,15,21,…9,15,21 , \ldots

Question 129

Multiple Choice

Use the partial sum formula to find the partial sum of the given arithmetic sequence.
-Find the sum of the first five terms of the arithmetic sequence 9,15,21,…9,15,21 , \ldots


A) 45
B) 75
C) 105
D) 210

Correct Answer:

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