Answer True (T) or False (F).

$\left\{0\right\}$ is a null set

All equivalent sets are equal sets

Answer True (T) or False (F).

The cardinal number of a set $A=\left\{\mathrm{positive} \mathrm{integers} \mathrm{less} \mathrm{than} 7\right\}$ is $6$.

 Which of the following is not an empty set?

 Which of the following is an infinite set? 

The cardinal number of the set of the letters of the word 'SCHOOL' is 

Which of the following pairs of sets are disjoint sets?