the entries in a 3X3 array include all the digits from 1 through 9,arranged so that the entries in every row and column are in increasing order.how many such arrays are there?这题的题目我可能有理解错了,

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the entries in a 3X3 array include all the digits from 1 through 9,arranged so that the entries in every row and column are in increasing order.how many such arrays are there?这题的题目我可能有理解错了,
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the entries in a 3X3 array include all the digits from 1 through 9,arranged so that the entries in every row and column are in increasing order.how many such arrays are there?这题的题目我可能有理解错了,
the entries in a 3X3 array include all the digits from 1 through 9,arranged so that the entries in every row and column are in increasing order.how many such arrays are there?
这题的题目我可能有理解错了,

the entries in a 3X3 array include all the digits from 1 through 9,arranged so that the entries in every row and column are in increasing order.how many such arrays are there?这题的题目我可能有理解错了,
确定了,答案是42