**Problem 5:** How many strings of length 6 decimal digits are there such that the first digit or the last digit is an odd digit? *(Example of such strings: 112346, 252325, 739243)***Problem 6:** How many strings of length 5 of lower case letters are there such that each letter does not appear more than once in the string?

Answered: How many strings of length 6 decimal…

How many strings of length 6 decimal digits are there such that the first digit or the last digit is an odd digit. (Example of such strings: 112346, 252325, 739243) 6.

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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Question

**Problem 5:** How many strings of length 6 decimal digits are there such that the first digit or the last digit is an odd digit?
*(Example of such strings: 112346, 252325, 739243)*

**Problem 6:** How many strings of length 5 of lower case letters are there such that each letter does not appear more than once in the string?

Expert Solution

Step 1

Since you have asked multiple questions here, we will solve the first question for you. To get the solution any question in specific please specify that question or post only that question.

The fundamental counting principle states that if there are p ways to do one thing, and q ways to do another thing, then there are $p \cdot q$ ways to do both things.

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