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:
Laurence can write 10 programs while Carrie Anne can write 5.
Laurence can make 6 sunglasses while Carrie Anne can make 4
Explanation:
Answer:
The answer to this question is given below in the explanation section.
Explanation:
The given compound statement are:
4 < 3 and 5 < 10
4 <3 or 5 < 10
not (5 > 13)
4 < 3 and 5 < 10 this statement is false because "and" logical operator required that both operand (4<3) and (5<10) are true. Statement (4<3) is a false statement so this statement is false. "and" operator becomes true when all its inputs are true otherwise it becomes false.
4 < 3 or 5 < 10 this statement is true because "or" logical operator to be true if one of its input is true and false when all inputs are false. so in this compound statement, the first statement is false and the second statement is true. so this compound statement is true.
not(5>13) this compound statement is true because it has "not" operator and "not" operator makes a false statement to true and vice versa. so (5>13) is a false statement, and when you append "not" operator before it, then this compound statement will become true statement, so this is a true statement.
In *nix, the ping command keeps on sending ICMP packets unless the "-c" (count) argument is passed. In Windows, ping defaults to 4 ICMP packets.
