There are 720 permutations of digits 1,2,3,4,5,6. suppose these permutations are arranged from smallest to largest numerical values, begginning from 123456 and ending with 654321. what no falls on the 124th position?

Dear jee king

total number that start with 1 is =5! =120

so at 121 position  213456 come

  122 position  213465 come

 123 position  213546 come

 124 position  213564 come

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