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Answer whether Right, Wrong, or Maybe in the following numbers. And why. * 4 x 4 matrix is nonsingular only if its rank is 4.

Answer whether Right, Wrong, or Maybe in the following numbers. And why.

* 4 x 4 matrix is nonsingular only if its rank is 4.

* {2x+3y=27, 6x+9y=82} the solution is not unique

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