Write the following intervals in set-builder form :
$\left[ {6,12} \right]$
$\left[ {6,12} \right] = \{ x:x \in R,6\, \le \,x\, \le 12\} $
Write the following sets in roster form :
$B = \{ x:x$ is a natural number less than ${\rm{ }}6\} $
State which of the following sets are finite or infinite :
$\{ x:x \in N$ and $2x – 1 = 0\} $
$\{ x:x \in N$ and $x$ is prime $\} $
$D = \{ x:x$ is a prime number which is divisor of $60\} $
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