Which of the following sets is a subset of all other sets?

If $A = \{1, 2, 3, \ldots, 10\}$,then the number of non-empty subsets of $A$ containing only odd numbers is

Write the following set in roster form:
$E =$ The set of all letters in the word $TRIGONOMETRY$

Let $x_{1}, x_{2}, \ldots, x_{15}$ be $15$ distinct numbers chosen from $1, 2, 3, \ldots, 15$. Then, the value of $(x_{1}-1)(x_{2}-1)(x_{3}-1) \ldots (x_{15}-1)$ is

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

If $A = \{2, 3, 4, 5, 6\}$,then which of the following statements has a truth value of 'false'?