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Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of four letters followed by five digits. Three letters were associated with each number from 2 to 9 (just as in the standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of nine digits. How many different sequences of nine digits were possible? GHI PRS 5 0 ABC JKL TUV 3 DEF MNO 9 WXY Ⓡ

Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of four letters followed by five digits. Three letters were associated with each number from 2 to 9 (just as in the standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of nine digits. How many different sequences of nine digits were possible? GHI PRS 5 0 ABC JKL TUV 3 DEF MNO 9 WXY Ⓡ

College Algebra
College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
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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Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of four letters followed by five digits. Three letters were associated with each number from 2 to 9 (just as in the standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of nine digits. How many different sequences of nine digits were possible? 4 GHI 7 PRS 2 5 8 0 ABC JKL TUV 3 DEF 6 MNO 9 WXY
Transcribed Image Text:Telephone Numbers In the past, a local telephone number in a country consisted of a sequence of four letters followed by five digits. Three letters were associated with each number from 2 to 9 (just as in the standard telephone layout shown in the figure) so that each telephone number corresponded to a sequence of nine digits. How many different sequences of nine digits were possible? 4 GHI 7 PRS 2 5 8 0 ABC JKL TUV 3 DEF 6 MNO 9 WXY
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