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Omni-MATH / How many ordered quadruples (a,b,c,d) of four distinct numbers chosen from the set 1,2,3,…,9 satisfy b<a,b<c, and d<c? · Discussion

Discussing How many ordered quadruples (a,b,c,d) of four distinct numbers chosen from the set {1,2,3,…,9} satisfy b<a,b<c, and d<c? · Omni-MATH

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