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If letters cannot be repeated, then there are 26 options for the first letter. There are then 25 options for the second letter. There are then 24 options for the third letter, and 23 for the fourth. This means that in total there are 26x25x24x23 options for the code. 26x25x24x23 = 358,800. Thus, there are 358,800 possible 4 letter codes.

Q: How many 4 letter codes are there if letters are not repeated?

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120

The number is 26*25*24 = 15600.

-5

11,232,000

If the numbers and letters can be repeated then there are 45,697,600 possible outcomes. If the letters and numbers can not be repeated there are 32,292,000 possible outcomes.

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-3

The number of 3-letter codes that can be formed without repetition is equal to the number of choices for the first letter (4 letters), multiplied by the number of choices for the second letter (3 letters), multiplied by the number of choices for the third letter (2 letters). Therefore, the total number of 3-letter codes that can be formed is 4 x 3 x 2 = 24.

Ther are 6 letters in the word letter two of which are repeated which gives a total of four different letters.

8^5=32,768 if letters can repeat 2,880 if letters can not be repeated.

120

The number is 26*25*24 = 15600.

There are 7893600 permutations.

26*25 = 650

-5

11,232,000

Since our postal codes are order like this (letter, number, letter) (number, letter, number) the result would be 26x10x26x10x26x10=17,576,000. There are 17,576,000 POSSIBLE postal codes in Canada.

If the numbers and letters can be repeated then there are 45,697,600 possible outcomes. If the letters and numbers can not be repeated there are 32,292,000 possible outcomes.