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Question

If A = ⎢ ⎢111213111⎥ ⎥ and B = ⎢ ⎢42250α123⎥ ⎥, If B is the inverse of A, then α is

A
2
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B
1
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C
2
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D
5
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Solution

The correct option is A 5
ofB=AAB=IAB=11122311142250α123
=1042α+3=100010001
compering elements
2α+3=0α=5

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