The first and last terms of an AP are \( a \) and \( l \) respectively. Show that the sum of the...

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The first and last terms of an AP are \( a \) and \( l \) respectively. Show that the sum of the \( n \)th term from the beginning and the \( n \)th term from the end is \( (a+l) \).
\( \therefore \)
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