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If A=[[1,0],[-1,7]] and A^2-8 A+k I=0, t...

If `A=[[1,0],[-1,7]]` and `A^2-8 A+k I=0`, then `k=`

A

a.-7

B

b.7

C

c.8

D

d.`(1)/(7)

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The correct Answer is:
B
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