Given digits 0,1,2,3,5,7 To find rank of 70513 Total number start with 1=5!=120 Number start with 2=5!=120 Number start with 3=5!=120 Number start with 5=5!=120 Number start with 701=6 Number start with 702=6 Number start with 703=6 ‌70512=1 ‌70513=1 Rank of 70513 ‌=4×120+3×6+2 ‌=500