In how many ways, the letters of the word 'BANKING' can

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In how many ways, the letters of the word 'BANKING' can be arranged ?

1. 5040
2. 2540
3. 5080
4. 2520
5. None of the above

Correct Option: D

Total letters = 7, but N has come twice.
So, required number of arrangements = 7 ! / 2 !
= [7 x 6 x 5 x 4 x 3 x 2 ! ] / 2 ! = 2520