UPSKILL MATH PLUS

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The sum of first \(n\), \(2n\) and \(3n\) terms of an A.P are \(S_1\), \(S_2\) and \(S_3\) respectively. Prove that \(S_3 = 3(S_2 - S_1)\).
 
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This is a self-assessment task. Solve this question and assess the solution steps after the test's completion on your own.