किसी स.श्रे. के n, 2n तथा 3n पदो का योगफ...

किसी स.श्रे. के n, 2n तथा 3n पदो का योगफल कमशः `S_(1),S_(2),S_(3)` है तो दिखाईए कि `S_(3) = 3(S_(2)-S_(1))`

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