Means of Arithmetic Sequence
One mean: the average · Many means: find d · n = m + 2
Recognise an arithmetic sequence and its common difference
Find one mean between two terms by averaging
Count the terms with n = m + 2
Find d and build several means
Common difference: d = t2 - t1
General term: tn = a + (n - 1)d
2, 4, 6, 8: a = 2, d = 2, t6 = 12
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