6. PYQ - Finding nth term of A.P

In an A.P., the total of the first \(10\) terms is \(285\) and the first term equals \(15\). Determine the value of the \(a_{20}\) and also write the expression for the nth term.
 
\(a_{20}\) \(=\)
 
 \(n^{\text{th}}\) term \(=\)
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