In an A.P. if \( a_{p+1}=2 a_{q+1} \), prove that \( a_{3 p+1}=2 a_{p+q+1} \).

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In an A.P. if \( a_{p+1}=2 a_{q+1} \), prove that \( a_{3 p+1}=2 a_{p+q+1} \).
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