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If every minor of order 'r' of a matrix 'A' is zero, then rank of 'A' is

a) greater than 'r'

b) equal to 'r'

c) less than or equal to 'r'

d) less than 'r'

a) greater than 'r'

b) equal to 'r'

c) less than or equal to 'r'

d) less than 'r'

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