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UPSC NDA II 2014 Mathematics Paper

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For the next two (02) items that follow:
Let Sn denote the sum of first n terms of an AP and 3Sn=S2n

[NDA II 2014]

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Question : 46

Total: 120

‌ What is ‌S3n:Sn‌ equal to? ‌

4:1
6:1
8:1
10:1

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