A telephone number includes a sequence of seven digits not, Ask an Expert

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A telephone number includes a sequence of seven digits not starting with 0 or 1.

a) How many of them begin with either 463, 460, or 400

b) How many telephone numbers are possible if no two adjacent digits are the same, for example: 235-9350 is permitted but not 223-6789

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91144175

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