A ___ is a literal number or any symbol which attains different values.

Q. Which of the following is a letter or symbol that represents a number or numbers?

Q. What is Valency of number and the difference when a number is written above a symbol (superscript) or below?

Q. A ___ is a symbol, such as x, used to describe any number.

Q. The total number of combinations of 2n different things taken any one or more at a time and total number of combinations of n different things taken one or more at a time is in the ratio 65: 1, then the value of n is equal to

Q. For any real number $a,$ the value of modulus of $a$ or $|a|$