Write the following as intervals :
$\{ x:x \in R,3\, \le \,x\, \le \,4\} $
$\{ x:x \in R,3\, \le \,x\, \le \,4\} = \left[ {3,4} \right]$
Let $S=\{1,2,3, \ldots, 40)$ and let $A$ be a subset of $S$ such that no two elements in $A$ have their sum divisible by 5 . What is the maximum number of elements possible in $A$ ?
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $x$ is prime $\} $
$\{ x:x \in N$ and ${x^2} = 4\} $
If $Q = \left\{ {x:x = {1 \over y},\,{\rm{where \,\,}}y \in N} \right\}$, then
Examine whether the following statements are true or false :
$\{ a\} \in \{ a,b,c\} $
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