|Rank of a Matrix|
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A matrix A is said to be of rank r if there is at least one non zero minor of order r and every minor of order r+1 is zero.
Consider a matrix A,
[2 -1 5]
|3 0 6|
[4 1 7]
So the minor of third order is zero
There exists a minor of second order
which is equal to 3
Thus a minor of second order is not zero.
So rank of A is 2
-ADARSH NITK Surathkal
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