A telephone number (in Lebanon) consists of two parts: a code made up of two digits of which the first is zero, and the actual number made up of six digits. a) How many codes are there if the code 00 cannot be used since it is used for international calls only? b) What is the maximum number of subscriber with the same code? c) What is the maximum number of subscribers with the fixed network nationwide if the codes 02 and 03 are not used?

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A telephone number (in Lebanon) consists of two-
parts: a code made up of two digits of which the
first is zero, and the actual number made up of six
digits.
a) How many codes are there if the code 00
cannot be used since it is used for
international calls only?
b) What is the maximum number of subscriber
with the same code?
c) What is the maximum number of subscribers
with the fixed network nationwide if the
codes 02 and 03 are not used?
d) The PTT ministry conducts a study predict-
ing future subscription demands. This study
estimates that the number of subscribers in
Beirut and its suburbs (code 01) will reach
7,000,000 in 5 years. Can the ministry
meet all the demands with the six-digit
numeration?
If so, state why, otherwise determine the
minimum number of digits necessary to meet
all the predicted demands.
e) The PTT ministry restricts the use of all
numbers beginning with 1 to its own services
nationwide (such as 11 for inquiries). What is
the maximum number of subscribers at the
telephone service of the PTT ministry?
Transcribed Image Text:A telephone number (in Lebanon) consists of two- parts: a code made up of two digits of which the first is zero, and the actual number made up of six digits. a) How many codes are there if the code 00 cannot be used since it is used for international calls only? b) What is the maximum number of subscriber with the same code? c) What is the maximum number of subscribers with the fixed network nationwide if the codes 02 and 03 are not used? d) The PTT ministry conducts a study predict- ing future subscription demands. This study estimates that the number of subscribers in Beirut and its suburbs (code 01) will reach 7,000,000 in 5 years. Can the ministry meet all the demands with the six-digit numeration? If so, state why, otherwise determine the minimum number of digits necessary to meet all the predicted demands. e) The PTT ministry restricts the use of all numbers beginning with 1 to its own services nationwide (such as 11 for inquiries). What is the maximum number of subscribers at the telephone service of the PTT ministry?
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