Find arrays if every row and column are in increasing order
The entries in the 3 x 3 array are all the digits from 1 to 9, arranged so that the entries in every row and every column are in increasing order. Given that the middle cell contains the number 5, how many such arrays are there?
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The entries in the 3 x 3 array are all the digits from 1 to 9, arranged so that the entries in every row and every column are in increasing order.
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What changes do you suggest for the three existing demographic categories?
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