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OpenStudy (kingj):
What is the 12th term of the arithmetic sequence where a1 = 5 and a6 = 20?
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OpenStudy (anonymous):
Arithmetic sequence implies delta between terms is constant. In this case, that constant will be (20-5)/5 = 3. So, the 20th term will be a1 + 19*3 = 5 + 57 = 62.
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