KVPY SX SB Exam 19-Nov-2017 Question Paper

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Question : 13 of 120

Marks: +1, -0

Let

A^{–1}=[\table 1 ,2017 ,2;1, 2017 ,4;1, 2018 ,8]

. Then

|2A| -|2A^{–1} |

is =equal to

3
–3
12
–12

Solution:

2 ^3 {|A|} -2^3 1/{|A|}

|A^{–1}|=[\table 1 ,2017 ,2;1, 2017 ,4;1, 2018 ,8]

1/{|A|}=-2⇒ {|A|} =-1/2

Put the value answer is = 12

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