How many 4-letter words with at least one vowel can be constructed from the letters A, B, C, D, E, and F? (Note that A and E are vowels, any word is valid, not just English language words, and letters may be used more than once.)
+505 To answer this question, you just need to subtract the number of words without vowels from the total number of words.
The total number of words is 6*6*6*6=1296
The total number of words without vowels is 4*4*4*4 = 256
Therefore, the answer to this question is 1296-256=1040 words.
