Mathematics, 29.01.2020 02:09 andybiersack154
Us telephone numbers consist of a 3-digit area code, a 3-digit exchange, and a 4-digit station number.
1. in how many ways can you arrange the 3-digit exchange and 4-digit
station number to form a telephone number?
2. suppose that someone randomly dials the area code in a long-distance call (in the us). the exchange and station numbers match yours. what is the probability that the number dialed is your phone number? (note: even though some area codes are not valid, such as 000, it is still possible to dial these numbers).
Answers: 1
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Us telephone numbers consist of a 3-digit area code, a 3-digit exchange, and a 4-digit station numbe...
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