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Question
Find the rank of the following matrices by minor method:
`[(-1, 3),(4, 7),(3, 4)]`
Solution
A = `[(-1, 3),(4, 7),(3, 4)]`
A is a matrix of order 3 × 2 and P(A) ≤ 2
Second order minor
`[(-1, 3),(4, -7)]`
= 7 – 12
= – 5 ≠ 0
∴ P(A) = 2
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