PS JULY 3 ( 4-6 )

If two sets A and B have 99 elements in common, then the number of elements common to each of the set A x B and B x A is -

The set of intelligent students in a class is a __________.

• Null set

• Singleton set

• Finite set

• Not a well defined set.

If a set A has ' n ' element then the total number of subsets of A is

The set of all prime numbers is _______ .

• A null set

• A singleton set

• An infinite set

• None of them

In a city 20 percent of the population travels by car, 50 percent travels by bus and 10 percent travels by both car and bus. The person travelling by car or bus is -

• 80 percent

• 40 percent

• 60 percent

• 50 percent

• 64

• 32

• 40

• 20

If 20 teachers of a school either teach mathematics or physics, 12 of them teach math's while 4 teach both subjects. Then the number of teachers teaching physics only is -

• 12

• 8

• 9

• 16

A set which does not contain any element is called a ________.

• Null set

• Singleton set

• Finite set

• Infinite set

In a survey of 1000 consumers it is found that 720 consumers liked product A and 450 liked product B. What is the least number that must have liked both the products ?

• 70

• 200

• 270

• 170