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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

I

b

I-A

c

3A

d

A

answer is C.

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Detailed Solution

A2=A(I+A)37A=(I+A)(I+A)27A=(I+A){(I+A)(I+A)}7A[IA=AI=A]=(I+A)(I+2A+A)7A            A2=A=(I+A)(I+3A)7A=I2+AI+3IA+3A27A=I+A+3A+3A7AA2=A&IA=AI=A=I

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