Answer: True
Explanation:
A language is said to be closed under a operation here the complement is the operation then if upon application of that operation to any members of that language always yields a member of that language.
regular languages are closed under complement. A proof of the statement is
If a regular language 'L' is regular then there is a DFA X recognizing that regular language 'L'. to show that L' (compliment) is regular we need to have another DFA X' recognizing L'.
The initial state and transition function of both the DFAs are same except their accepting state. Then we can say that X' accepts L'.
So, we can say that regular languages are closed under complement.
Answer:
a) We know that atleast one or more author writes a book.
Symbol to indicate one or more is (B)
So the correct option is B
b) We know that zero to multiple books are written by any author.
Symbol to indicate zero or more is (A)
So the correct option is A
c) The fourth option is correct if we replace by many to many relationship and generate a new entity.
So the relationship betweem author and contract is one to many. So we know that there is atleast one author that represent in symbol d and books has atleast 0 that represent in symbol c.
So Fourth Option is correct d at blue side and c at red side.
d) There are two forirgn keys in table Contract one is from AuthorId and other is ISBN.
So correcct option is C
Answer:
You can have many catch blocks to handle different types of exceptions.
Explanation:
In programming, catch and try are blocks of codes that are written to handle errors. While the try block of code will allow for the definition of code blocks which are tested for errors, the catch block of code allows the programmer to define the block of code to be executed if an error occurs in the try block.... somewhat like the if....else statements. since there could be different error handling scenarios,one can have as many catch blocks for different error exceptions
Answer:
I'm sorry I'd been looking at this question a while and I can't seen to figure it out.
Answer:
a. Microphone
d. Wi-Fi antenna
Explanation:
The wifi antenna , is present in the screen bezel , and the two cables are connected to the motherboard and the wifi adapter .
Hence , we need to be aware of the wifi antenna , before installing the webcam .
Microphone , as in most of the laptop , the microphone is present just near the screen bezel , and hence , need to be aware of before the installation process of the webcam .
