Sets Test - 21...

The number of subsets of the set $A=\{ { a }_{ 1 },{ a }_{ 2 },.........{ a }_{ n }\}$ which contain even number of elements is

Let $S=\{2,4,6,8,......20\}$. What is the maximum number of subsets does $S$ have ?

Which of the following collections is a set?

For sets $\phi  , A = \left \{ 1,3 \right \} = B = \left \{ 1, 5, 9 \right \} , C = \left \{ 1, 5, 7, 9 \right \}$ True option is 

If  $A = \left \{ 2 , 4, 6, 8 \right \}$ and $B = \left \{ 1, 4, 7, 8 \right \}$ then A - B and B - A will be respectively:

If  $A = \left \{ 1, 2, 3, 4, 5, 6 \right \} , B = \left \{ 2, 4, 6, 8 \right \}$, then A - B will be : 

If $A=${1,2,3};$B=${4,5}. then $A-B=${1,2,3}  number cancellation of numbers in A and B

In an examination, $34\%$ of  the candidates fail in Arithmetic and $42\%$ in  English. If $20\%$ fail in Arithmetic and English, the  percentage of those passing in both subjects is :

The smallest set $A$ such that $A\cup \left\{ 1,2 \right\} =\left\{ 1,2,3,5,9 \right\}$ is 

If A = {1, 2, 3} B = {4, 5}, then find A - B.