Question
what will be the rank of word OPTION in the dictionary of words formed by letters of the word OPTION
Joshi sir comment
OPTION
ordered way INOOPT
total words = 6!/2! = 360
so rank = (360/6)*2+([60*2]/5)*3+(24/4)*3+(6/3)*0+(2/2)*1+1 = 120+72+18+0+1+1 = 212