Subsets

In interval notation$(a,b)=x|a<x<b,(a,b)$represents

Let $A=\left\{x:x\le 9,x\in N\right\}$. Let $B=\left\{a,b,c\right\}$ be the subset of $A$ where $\left(a+b+c\right)$ is a multiple of $3$. What is the largest possible number of subsets like $B$?

How can we find the number of subsets?

Which of the following is true?

If $\mathrm{A}=\{1, 2, 3, 4, 5, 6, 7\}$, then the number of proper subsets of $\mathrm{A}$ is

If $X=\left\{1,2,3,\dots ,10\right\}$ and $A=\left\{1,2,3,4,5\right\}$ Then, the number of subsets $B$ of $X$ such that $A-B=\left\{4\right\}$ is

If $A=\left\{1,2,3,\dots \dots 10\right\}$ then number of subsets of $A$ containing only odd numbers is

The number of proper subsets of a set having $n+1$ elements is$?$

Let $A,B$ and $C$ be three sets. If $A\in B$ and $B\subset C$, is it true that $A\subset C?$. If not, give an example.

Let $A=\left\{a,b\right\}, B=\left\{a,b,c\right\}.$ Is $A\subset B?$ What is $A\cup B?$

What is meant by subset?

If $A=\left\{x:\left|x\right|<3,x\in Z\right\}$ then the number of subsets of $A$ is-

If $\phi$ is a subset of both $A \& B$ then can we say that $A \& B$ are also subset of each other?

List all the subsets of the set $\left\{-1, 0, 1\right\}$.

Let $A, B$ and $C$ be three sets. If $A\in B$ and $B\subset C$, is it true that $A\subset C$? If not, give an example.

Let $A=\left\{a, e, i, o, u\right\}$ and $B=\left\{a, b, c, d\right\}$. Is $A$ a subset of $B$ ? Is $B$ a subset of $A$? 

Give one example of subset

Which of the following is true?

If $N$ denotes the number of non-empty subsets of $\left\{1,2,3,\dots .12\right\}$ having property that the sum of largest and smallest elements is $13$ , then the number of positive integral divisors of $N$ which are divisible by $5$ is

Two finite sets have $m$ and $n$ elements. The number of subsets of the first set is $240$ more than that of the second. The values of $m$ and $n$ are respectively