If A^(5) is null square matrix and A^(3)...

If `A^(5)` is null square matrix and `A^(3)!=0` and `(I-A)` is the inverse of matrix `I+A+A^(2)+.........+A^(n)`, then possible value of `n` can be (`I` is the identity matrix of same order as that of `A` )

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