UPSC NDA 2 2012 Mathematics Paper
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Directions (Qs. 14 and 15): For the next two (O2) questions that follows:
The sum of first 10 terms and 20 terms of an AP are 120 and 440 respectively.
The sum of first 10 terms and 20 terms of an AP are 120 and 440 respectively.
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Question : 15 of 120
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What is the common difference?
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