Mathematics

Mathematics

Problem

For an arithmetic progression, SnS_n denotes the sum of its first nn terms. The sum of the terms from the ppth to the qqth term (both inclusive) is given by a) Sq−SpS_q-S_p b) Sq−Sp−1q−p+1\dfrac{S_q-S_{p-1}}{q-p+1} c) Sq−Sp−1S_q-S_{p-1} d) Sq−1−Sp−1S_{q-1}-S_{p-1}

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