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UPSC NDA I 2022 Mathematics Solved Paper

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Question : 1

Total: 120

If ∆1=|

1	p	q
1	q	r
1	r	p

1	1	1
q	r	p
r	p	q

| where p≠q≠r, then ∆1+∆2 is

0
always positive
always negative
positive if p,q,r are positive else negative .

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