Question

ZIP Codes In 1963, the United States Postal Service launched the Zoning Improvement Plan (ZIP) Code to streamline the mail-delivery system. A ZIP code consists of a five-digit sequence of numbers. (a) Find the number of ZIP codes consisting of five digits. (b) Find the number of ZIP codes consisting of five digits, if the first digit is a 1 or a 2. 

          ZIP Codes In 1963, the United States Postal Service launched the Zoning Improvement Plan (ZIP) Code to
streamline the mail-delivery system. A ZIP code consists of a five-digit sequence of numbers.
(a) Find the number of ZIP codes consisting of five digits.
(b) Find the number of ZIP codes consisting of five digits, if the first digit is a 1 or a 2.
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Added by Juan W.

Calculus: Early Transcendentals
Calculus: Early Transcendentals
James Stewart 8th Edition
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ZIP Codes In 1963, the United States Postal Service launched the Zoning Improvement Plan (ZIP) Code to streamline the mail-delivery system. A ZIP code consists of a five-digit sequence of numbers. (a) Find the number of ZIP codes consisting of five digits. (b) Find the number of ZIP codes consisting of five digits, if the first digit is a 1 or a 2.
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Transcript

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00:01 Hi, from the question given that suppose a zonal zip code.
00:12 So zip code consists of five digit sequence number.
00:34 So in part a we need to find the number of zip codes consisting of five digits.
00:40 So for the first portion, first position, any one of the.
00:50 10 numbers.
00:54 So 10 numbers.
00:59 Since the numbers are 0, 1, 2, 3, 4, 5, 7, 8, 9.
01:08 Similarly, the second position also has 10 possibilities...
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