t(n) = 1 + 3n (n = 1, 2, 3, ... )
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10
{4} is one example, {4, 13, 4, 16, 4} is another.
There is an interval of 3 between the numbers 1+3=4 4+3=7 7+3=10 10+3=13 13+3=16 16+3=19 19+3=22 22+3=25
Average is a casual word . You need to know the MEAN Mean = {10+12+14+16)/4 mean = 52/4 mean = 13 The answer!!!!
16.