Sets Test - 26...

Let $$A = \{2,3,5,7,8,11\}$$ then which among the following is true?

Which of the following statements is true

Let $$P = \{ x | x$$ is a multiple of $$3$$ and less than $$100 $$ ,$$x$$ $$\displaystyle \in $$ $$N \}$$
$$Q = \{ x | x$$ is a multiple of $$10$$ and less than $$100$$, $$x$$ $$\displaystyle \in$$ $$N\}$$

If X and Y are two sets then $$\displaystyle X\cap (Y\cup X)'$$ equals:

If $$n (A) = 115, n(B) = 326, n(A - B) = 47$$, then $$\displaystyle n(A+B)$$ is equal to 

Which of the following statements is true ?

Given $$\displaystyle \xi $$ = {x : x is a natural number}
A = {x : x is an even number x $$\displaystyle \in $$ N}
B = {x : x is an odd number, x $$\displaystyle \in $$ N}
Then $$\displaystyle (B\cap A)-(x-A)=....$$

If n (A) = 120, N(B) = 250 and n (A - B) = 52, then find $$\displaystyle n(A\cup B)$$

If A and B are two disjoint sets and N is the universal set then $$\displaystyle A^{c}\cup \left [ \left ( A\cup B \right )\cap B^{c} \right ]$$ is

Suppose $$\displaystyle A_{1},A_{2}.....A_{30}$$ are thirty sets having 5 elements and $$\displaystyle B_{1},B_{2}....B_{n}$$ are n sets each with 3 elements. Let $$\displaystyle \bigcup_{i=1}^{30}Ai=\bigcup_{i=1}^{n}Bj=S$$ and each elements of S belongs to exactly 10 of the Ai's and exactly 9 of the Bj's. Then n is equal to