If S1,S2,S3 denote the sum of first 11 terms of three arithmetic progr – InterviewSolution

1.	If S1,S2,S3 denote the sum of first 11 terms of three arithmetic progressions whose first terms are unity and their common differences are in harmonic progressions, then the value of (2S3S1−S1S2−S2S3S1−2S2+S3) is
Answer» If $S_{1}, S_{2}, S_{3}$ denote the sum of first $11$ terms of three arithmetic progressions whose first terms are unity and their common differences are in harmonic progressions, then the value of $(\frac{2 S_{3} S_{1} - S_{1} S_{2} - S_{2} S_{3}}{S_{1} - 2 S_{2} + S_{3}})$ is

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