In a survey of 300 companies, the number of companies using different Media-Newspapers N(N), Radio (R) and Television (T) are as follows: $N(N) = 200$, $N(R) = 100$, $N(T) = 40$, $N(N \cap R) = 20$, $N(R \cap T) = 20$, $N(N \cap T) = 30$ and $N(N \cap R \cap T) = 5$. Find the numbers of companies using none of these media:

The numbers of proper subset of the set $(3, 4, 5, 6, 7)$ is

If $A = (1, 2, 3, 4, 5, 6, 7)$ and $B = (2, 4, 6, 8)$. Cardinal number of $A - B$ is:

$ (A^c)^c = ?$ Note: This que is from matrix (deleted topic).

Two finite sets respectively have $x$ and $y$ number of elements. The total number of subsets of the first is $56$ more than the total number of subsets of the second. The value of $x$ and $y$ respectively.

The set of cubes of the natural number is:

The number of integers from $1$ to $100$ which are neither divisible by $3$ nor by $5$ nor by $7$ is