How many telephone numbers have no 0 in the prefix

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Reference no: EM131239787

1. How many words of length w can be made using an alphabet with l letters?

2. How many telephone numbers have no 0 in the prefix (the first three numbers before the hyphen)?

3. True or false: if A∩B∩C = 0, then the sum principle applies so / |A∪B∪C|= |A|+|B|+|C|.

4. How many words of length w can be made using a set of alphabets with a_j letters for the jth letter in a word?

Reference no: EM131239787

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