Let \( a_{n} \) be the nth term of an \( A P \). If \( \sum_{r=1}^{100} a_{2 r}=\alpha \) and \(....

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Let \( a_{n} \) be the nth term of an \( A P \). If \( \sum_{r=1}^{100} a_{2 r}=\alpha \) and
\( \mathrm{P} \)
\( \sum_{r=1}^{100} a_{2 r-1}=\beta \), the common difference of the \( A P \) is
(1) \( \alpha-\beta \)
(2) \( \beta-\alpha \)
(3) \( \frac{\alpha-\beta}{2} \)
(4) None of these


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