All the numbers that can be formed using 1, 2, 3, 4, 5 are arranged in the decreasing order and ranked. Then the rank of 35241 is

Decreasing order of given digits : 54321To find rank of 35241The number of numbers :                 starting with 5     = 4!        ''       ''   4     =4!         ''      ''   354 = 2!The next number in decreasing order is 35241Rank of 35241=2×4! + 1×2! + 1= 51