AMC / AIME · Arithmetic Sequences · Hard

Arithmetic Sequences: math and math for an arithmetic sequence. Find math.

Common differences.

Try the problem

S30=765S_{30}=765 and a1=4a_1=4 for an arithmetic sequence. Find dd.

Hint and answer

Concept to use

Nested conditions.

Hint

Write the term or sum formula before substituting.

Answer

5/3

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