the letter without repetitions,how many 4 letter codes can be formed,if it contain 3 consonants

To solve this problem, we need to calculate how many 4-letter codes can be formed with exactly 3 consonants and 1 vowel, without any repetition of letters.

### Step 1: Determine the number of consonants and vowels in the alphabet.
- **Total consonants**: 21 (since there are 26 letters in the English alphabet

Learn how to calculate the number of 4-letter codes that can be formed using 3 consonants and 1 vowel without repetition. This problem involves combinatorics, specifically selecting and arranging letters to form codes. Suitable for advanced high school students.

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