[Math] finding number of submatrices of a matrix of given order

matrices

How do we calculate the number of possible submatrices of a matrix of order $5\times 6$?

options for the answer are:

  1. $465$

  2. $1953$

  3. $2048$

  4. $30$

Best Answer

Hint: select a subset of rows and then a subset of columns. Empty sets are not allowed.

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