_____6. Which is the correct formula for nth term of an arithmetic sequence?
a. an = a1 + (d − 1)n c. an = a1 + (n − 1)d
b. an = n + (a1 − 1) d d. Sn =
n
2
[2a1 + (n − 1)d]
a. an = a1 + (d − 1)n c. an = a1 + (n − 1)d
b. an = n + (a1 − 1) d d. Sn =
n
2
[2a1 + (n − 1)d]
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Answer:
6) C. an = a1 + (n - 1)d
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