Let X = {a, b, c}. How many strings of length 3 over X are there with one letter appearing at least twice in the string? Show your work.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.1: Sets
Problem 10E
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Let X = {a, b, c}. How many strings of length 3 over X are there with one letter appearing at least twice in the string? Show your work.
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