यदि एक गु. श्रे. के n, 2n, 3n पदों का यो...

यदि एक गु. श्रे. के n, 2n, 3n पदों का योगफल क्रमशः `S_(1),S_(2),S_(3)` हो, तो सिद्ध कीजिए कि- `S_(1)^(2)+S_(2)^(2)=S_(1)(S_(2)+S_(3))`

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The correct Answer is:

`S_(1)(S_(2)+S_(3))`

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