If the \( p \) th term of an A.P. is \( q \) and \( q \) th term is \( p \), prove that the \( r...

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If the \( p \) th term of an A.P. is \( q \) and \( q \) th term is \( p \), prove that the \( r \) th term is \( p+q-r \).
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