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A. Find the indicated term for each sequence

1) 9, 12, 15, ... (12th term)
2) 1, —4, —9, ... (15th term)
3) 4, 7, 10, ... (10th term)

B. Find the sum of the terms of the following arithmetic sequence

1) 16, 21, 26, ... , a18
2) 6, 9, 12, 15, ... a22
3) 12, 24, 36, 48, ... a25