Subsets

If $A=\left\{1,2,3\right\}$, then how many elements are there in the power set of $A ?$

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?

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

Which of the following could be a super set of the set $X=\left\{x:x \mathrm{is} \mathrm{an} \mathrm{equilateral} \mathrm{triangle}\right\}$?

If the number of elements in the power set of set $A$ is $128$, then find the number of elements in the set $A.$

For sets $A$ and $B,$ which is false$?$

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.

The number of subsets of the power set of set $A=\left\{7,10,11\right\}$ is

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 $\phi$ 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 $A$? 

If $A=\{1,3,5\}$ how many elements has $P\left(A\right)?$

If $X=\left\{8^n-7n-1:n\in N\right\} \text{ and }Y=\left\{49\left(n-1\right):n\in N\right\}$, then 

Let $Z$ be the set of integers. If $A=\left\{x\in Z:2^{(x+2)\left(x^2-5x+6\right)}=1\right\}$ and $B=\{x\in Z:-3<2x-1<9\}$, then find the number of subsets of the set $A\times B$.

Find the length of interval $\left(8,32\right)$.