The positive five-digit integers that use each of the digits 1, 2, 3, 4 and 5 exactly once are ordered from least to greatest. What is the 16th integer in the list?
+118609 The positive five-digit integers that use each of the digits 1, 2, 3, 4 and 5 exactly once are ordered from least to greatest. What is the 16th integer in the list?
How many start with 1? 4!=24
So it starts with 1
How many start with 12? 3!=6
So 6 start start with 12
another 6 start with 13
another 6 start with 14
14532 is the 18th
14523 is the 17th
14352 is the 16th.
Just as EP said
