Find n for the given value of an in the arithmetic sequence.an = 1640; 1, 2, 3, . . .
A. n = 820
B. n = 39
C. n = 3280
D. n = 40
Answer: D
Mathematics
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A. 9z + 1 B. 11z + 1 C. 11z + 3 D. 10z + 1
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