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Three-letter codes with no letter repeated are made from the 26 English letters, and every code must begin with a vowel. How many codes are possible?

Competition practicePermutations & Combinations
  • A3380
  • B15600
  • C2875
  • D3000

Step-by-Step Solution

First letter: 5 vowels. Then 25 and 24 of the remaining letters: allows repeats.)
Answer: D) 3000

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