how many 10 bit strings start and end with the same number

C++ for Engineers and Scientists
4th Edition
ISBN:9781133187844
Author:Bronson, Gary J.
Publisher:Bronson, Gary J.
Chapter3: Assignment, Formatting, And Interactive Input
Section3.2: Formatting Numbers For Program Output
Problem 8E
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how many 10 bit strings start and end with the same number

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This problem can be solved by using the combinations formula, as there are 8 places and each place can have 2 possible values.

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