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Q.

If A2=2A-I then for n2, An=

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a

nA–I 

b

nA – (n–1)I

c

nA–(n–2)I

d

nA–2I

answer is A.

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Detailed Solution

A2=2A-I Let  n=3    A3=A2·A                               =(2A-I) A                               =2A2-A                               =2(2A-I)-A                               =4A-2I-A                               =3A-2I

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