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If the letters of the word are arranged as in a dictionary. M and n are the rank of the words BULBUL and NANNU respectively, then the value of m-4n is

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The correct Answer is:
3
For BULBUL, the letters in alphabetical order are BBLLUU
`B Bto(4!)/(2!2!)=6"BULBLU"to1`
`BL to (4!)/(2!)=12"BULBUL"to1`
`BU to (3!)/(2!)=39`
`thereforem=6+12+3+1+1=23`
For NANNU
The letters in alphabetical order are ANNNU
`A to (4!)/(3!)=4"NANNU"to1`
`thereforen=4+1=5`
hence, `m-4n=23-20=3`
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