Can somebody help me to figure out whether 2 and 3 have different meanings ?
Consider 4 vowels (including a) and 8 consonants (including b)
1)How many 5 letters "words" containing 2 different vowels and 3 different consonants can be formed from the letters ?
2)How many of them contain 'b' ?
3)How many of them being with 'b' ?