If 6 digits number's are formed using the digits 0,1,3,3,6,7 and arranged in ascending order, then the position of the number ′′631307′′ is
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Solution
Numbers cannot start from 0 Total numbers starting from 1 are 5!2!=60 Total numbers starting from 3 are 5!=120 Total numbers starting from 60 are 4!2!=12 Total numbers starting from 61 are 4!2!=12 Total numbers starting from 630 are 3!=6 Total numbers starting from 6310 are 2!=2 Next number will be ′′631307′′ position of the number ′′631307′′=60+120+12+12+6+2+1=213