Assuming you don't repeat letters:* 7 options for the first letter
* 6 options for the second letter
* 5 options for the third letter
* 4 options for the fourth letter
(Multiply all of the above together.)
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There are 13 letters in "the world topic". This includes 2 ts and 2 os. Therefore there are 13!/[2!*2!] = 1556755200 different arrangements.
There are 12 two letter arrangements of the letters in PARK.
The word "BOX" consists of 3 distinct letters. The number of arrangements of these letters can be calculated using the factorial of the number of letters, which is 3! (3 factorial). Therefore, the total number of arrangements is 3! = 3 × 2 × 1 = 6. Thus, there are 6 possible arrangements of the letters in "BOX."
The largest Roman numeral number that can be made without using a bar is 3,999, which is represented by the letters MMMCMXCIX.