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All columns in a matrix must have the same mode and the _________ length.

a) Different
b) Same
c) May be the same
d) May be different

Answer: b
Explanation: All columns in a matrix must have the same mode(numeric, character, etc) and also the same length. byrow=TRUE indicates that the matrix should be filled by rows. byrow=FALSE indicates that the matrix should be filled by columns (the default).

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