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22 March, 00:55

What rule can be used to find the next term of the arithmetic sequence? 39, 60, 81, 102, 123, ...

A. an = an-1 - 39

B. an = an-1 - 21

C. an = an-1 + 21

D. an = an-1 + 39

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  1. 22 March, 01:19
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    an = a n-1 + 21 the answer is c
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