A) 3I
B) 0
C) I
D) 2I
Correct Answer: C
Given $ A^{2}=A. $ Now, $ {{(I+A)}^{3}}-7A=I^{3}+3I^{2}A+3IA^{2}+A^{3}-7A $
$ =I+3A+3A+A-7A $
$ =I+O=I $
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