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Let A= [(1,2),(-1,4)]. If A^(-1)= alpha ...

Let `A= [(1,2),(-1,4)]`. If `A^(-1)= alpha I +beta A, alpha, beta in R`, I is a `2 xx 2` identity matrix, then `4(alpha-beta)` is equal to

A

5

B

`(8)/(3)`

C

2

D

4

Text Solution

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The correct Answer is:
D
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