Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of two letters followed by five digits. Three letters were associated with each number standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of seven digits. How many different sequences of seven digits were possible? GHI PRS 5 8 0 ABC JKL TUV 3 DEF 6 MNO 9 WXY
Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of two letters followed by five digits. Three letters were associated with each number standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of seven digits. How many different sequences of seven digits were possible? GHI PRS 5 8 0 ABC JKL TUV 3 DEF 6 MNO 9 WXY
Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 21E: License Plate Numbers In the state of Pennsylvania, each standard automobile license plate number...
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