Ononot — If an is an arithmetic sequence such that a1 + a2 + \dots +

Arithmetic Sequencesmedium

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If $a_n$ is an arithmetic sequence such that $a_1 + a_2 + \dots + a_p = q$ and $a_1 + a_2 + \dots + a_q = p$ , what is the sum of the first $p+q$ terms?