Which of the following sets are null sets:
A). 2 and 3
B). {x: x < 5, x > 6}
C). {x: |x |< -4, x ?N}
D). Set of all prime numbers between 15 and 19
Which of the following are true:
A). 1 and 2
B). {x: x >3, x ?0} ? ?
C). {x: x2-1= 0, x ?N} ? {-1, 1}
D). {x: x2 - 4x + 3 = 0} = {1, 3}
Two finite sets have m and n elements. The total number of subsets of the first set is 56 more than the total number of subsets of the second set. The values of m and n are respectively
A). 4,1
B). 6, 3
C). 8, 5
D). none of these
Let A = {x: x is a digit in the number 3591}, B = {x: x ? N, x<10}. Which of the following is false?
A). A? B = {1,3,5,9}
B). A-B = {2,4,6,7,8}
C). A U B = {1,2,3,4,5,6,7,8,9}
D). none of these
If A = {4n -3n -1: n ? N} and B = {9(n-1): n ? N}, then we have
A). B A
B). A B
C). A? B = ?
D). none of these