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UPSC NDA II 2011 Mathematics Paper

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Question : 98

Total: 120

What is the area of the triangle with vertices (1,2,3), (2,5,−1) and (−1,1,2) ?

‌
√155
2
square units
‌
√175
2
square units
‌
√155
4
square units
‌
√175
4
square units

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