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For A = {a,b}, how many strings can be built of size 4 that contain at most 2 b's?    3   7   1   11

For A = {a,b}, how many strings can be built of size 4 that contain at most 2 b's?    3   7   1   11

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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I have 3 questions that need answering.

 

 

For A = {a,b}, how many strings can be built of size 4 that contain at most 2 b's? 
 

3
 

7
 

1
 

11

 

if we have a relation x R y such that x mod y == even, for x = {1,2,3}, y = {1,4,7}, which of the following is a relation?
 

x = 2, y = 4
 

x = 1, y = 4
 

there is no solution to this
 

there are infinite number of solutions to this

 

 

 

For all objects J, if J is a square then J has four sides. 

The above is not equivalent to which of the following:
 

there exists at least one four sided square in J
 

every square has four sides
 

all squares have four sides
 

if J is a square then J has four sides
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