How many 8–bit strings do not begin with 000? Hint: the sum rule tells us that, if A and B are disjoint, then |A∪B| = |A|+|B|. Equivalently, this means that |A| = |A ∪ B| − |B|. This is a very convenient counting technique: count the number of elements in A by counting the total number of elements in A ∪ B and the number of elements in the complement of A

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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How many 8–bit strings do not begin with 000?
Hint: the sum rule tells us that, if A and B are disjoint, then |A∪B| = |A|+|B|. Equivalently, this means that |A| = |A ∪ B| − |B|. This is a very convenient counting technique: count the number of elements in A by counting the total number of elements in A ∪ B and the number of elements in the complement of A 

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