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Q.

If A is square matrix such that A2=A, then (I+A)37A is equal to

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a

A

b

I – A

c

I

d

3A

answer is C.

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Detailed Solution

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A2=A, (I+A)3-7A=(I+A)(I+A)(I+A)-7A                                   =(I+A+A+A2)(I+A)-7A                                   =(I+2A+A2)(I+A)-7A                                   =(I+2A+A)(I+A)-7A                                   =(I+3A)(I+A)-7A                                   =I+4A+3A-7A                                   =I

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