In how many ways, the letters of the word 'ARMOUR' can be

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

1. 720
2. 300
3. 640
4. 350
5. None of the above

Correct Option: E

Number of arrangements n ! /( p ! q ! r ! )
Total letters = 6, but R has come twice.
So, required number of arrangements
= 6 ! / 2 ! = (6 x 5 x 4 x 3 x 2 !) / 2 ! = 360