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,](/uploads/image/z/13202175-39-5.jpg?t=the+entries+in+a+3X3+array+include+all+the+digits+from+1+through+9%2Carranged+so+that+the+entries+in+every+row+and+column+are+in+increasing+order.how+many+such+arrays+are+there%3F%E8%BF%99%E9%A2%98%E7%9A%84%E9%A2%98%E7%9B%AE%E6%88%91%E5%8F%AF%E8%83%BD%E6%9C%89%E7%90%86%E8%A7%A3%E9%94%99%E4%BA%86%2C)
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