In a certain country, area codes have three digits and are subject to the following restrictions. The first digit cannot be 0 or 1; the second digit can only be 0, 1, or 2; and there are no restrictions on the third digit. How many different area codes are possible? Express the number of area codes as a product. Total number of area codes = nothing (Do not multiply.)
In a certain country, area codes have three digits and are subject to the following restrictions. The first digit cannot be 0 or 1; the second digit can only be 0, 1, or 2; and there are no restrictions on the third digit. How many different area codes are possible? Express the number of area codes as a product. Total number of area codes = nothing (Do not multiply.)
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
In a certain country, area codes have
three
digits and are subject to the following restrictions. The first digit cannot be
0 or 1;
the second digit can only be
0, 1, or 2;
and there are no restrictions on the
third
digit.
How many different area codes are possible?Express the number of area codes as a product.
Total number of area codes = nothing
(Do not multiply.)
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