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5. How many strings of 3 characters are there, such that every character is a lower case letter, the 3 characters must be different?

5. How many strings of 3 characters are there, such that every character is a lower case letter, the 3 characters must be different?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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**Problem 4:** Suppose that Mr. H paid $500 for his insurance in 2018. It is expected that every year the insurance fee will be increased by $50 compared to the previous year. Compute the expected total insurance fee that will be paid by Mr. H from 2019 to 2055. (Including year 2019 and 2055.) **Problem 5:** How many strings of 3 characters are there, such that every character is a lowercase letter, and the 3 characters must be different?
Transcribed Image Text:**Problem 4:** Suppose that Mr. H paid $500 for his insurance in 2018. It is expected that every year the insurance fee will be increased by $50 compared to the previous year. Compute the expected total insurance fee that will be paid by Mr. H from 2019 to 2055. (Including year 2019 and 2055.) **Problem 5:** How many strings of 3 characters are there, such that every character is a lowercase letter, and the 3 characters must be different?
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