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Q26.

Expert-verifiedFound in: Page 636

Book edition
Middle English Edition

Author(s)
Carter

Pages
804 pages

ISBN
9780079039903

**How many area codes were possible before 1995?**

The number of possible area codes before 1995 is** 160.**

Given that before 1995, area codes had the format (XYZ)

where X = 2,3, …, or 9

Y = 0 or 1

Z = 0, 1, 2, …, or 9

It is to be determined how many area codes were possible before 1995.

For X there are 8 ways to be selected.

For Y there are 2 ways to be selected.

For Z there are 10 ways to be selected.

By the Fundamental Counting Principle, there are $8\times 2\times 10=160$ different ways to select the 3-digit area code.

Hence, the number of possible area codes before 1995 is 160.

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