Q 2464223155.     If `X` is any matrix of order `n xx p` (`n` and `p` are
integers) and `I` is an identity matrix of order
`n xx n`, then the matrix `M =I- X(X' X)^(-1) X'`
is(i) idempotent matrix
(ii) `MX = O`

Choose the correct answer

UPSEE 2011

(This question may have multiple correct answers)

A (i) is correct
B (ii) is correct
C (i) is incorrect
D (ii) is incorrect

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