How many strings of length four of uppercase English letters are there which have to be repeated letters?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter8: Data And Network Communication Technology
Section: Chapter Questions
Problem 34VE
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How many strings of length four of uppercase English letters are there which have to be repeated letters?
264
(26 x 25 x 24 x 23)
264
(26 x 25 x 24 x 23) - (4 x 26)
264
26³
26 x 25 x 24 x 23
Transcribed Image Text:264 (26 x 25 x 24 x 23) 264 (26 x 25 x 24 x 23) - (4 x 26) 264 26³ 26 x 25 x 24 x 23
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