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Q.

If A=1000110−24,6A−1=A2+cA+dI then (c,d) is

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a

(– 6, 11)

b

(–11, 6)

c

(11, 6)

d

(6, 11)

answer is A.

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Detailed Solution

6A−1=A2+cA+dI⇒ 6I=A3+cA2+dAWe have A2=1000110−241000110−24=1000−150−1014and A3=A2A=1000−150−10141000110−24=1000−11190−3846Now, 6I=A3+cA2+dA6=1+c+d, 0=19+5c+d6=−11−c+d6=46+14c+4d, 0=−38−10c−2d⇒ d=11, c=−6
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