Basic of Sets

Symbol used to represent intersection of the set is ___.

State the set as finite or infinite, $\{ x: x$ is a whole number less than $20$ $\}$

State whether the set $\{ x:x$ is an integer between $-60$ and $60$ $\}$ is finite or infinite.

State the set, $\{$ Number of people in India$\}$ as finite or infinite.

Classify the set $\{\text{Diagonals of a hexagon} \mathrm{ABCDE}\}$ as finite, infinite, empty, and singleton.

Identify the Set of all multiples of $10$ as finite or infinite set.