How many different permutations of the letters a,b,c,d,e and f are there if each letter can be used once only? how many of these: a. end with e d, b. begin with f and end with a , c. begin and end with a vowel
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How many different permutations of the letters a,b,c,d,e and f are there if each letter can be used once only? how many of these: a. end with e d, b. begin with f and end with a , c. begin and end with a vowel
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