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AMC / AIME · Arithmetic Sequences · Easy

Arithmetic Sequences: Find the average of the first and last terms of math.

Common differences.

Try the problem

Find the average of the first and last terms of 8,11,…,298,11,\ldots,29.

Hint and answer

Concept to use

$a_n$ formula.

Hint

Use an=a1+(n−1)da_n=a_1+(n-1)d.

Answer

37/2

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