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UPSC NDA I 2014 Mathematics Paper

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For the next two (02) items that follow:
Let

|

→

a

|=7,|

→

b

|=11,|

→

a

+

→

b

|=10√3

[NDA I 2014]

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Question : 73

Total: 120

‌ What is ‌|

|‌ equal to? ‌

2√2
2√10
5
10

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