KEAM 2011 Math Paper

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Question : 102 of 120

Marks: +1, -0

If A=[

1	2	2
2	1	−2
a	2	b

] is a matrix satisfying AAT=9I3, then the values of a and b are respectively

1,2
−1,2
−1,−2
2,1
−2,−1

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