Letters used to represent numbers are called _______.
A symbol which takes various numerical values is called a variable
Final Answer : Letters used to represent numbers are called Variables .
Serial numbers for an item produced in a factory are to be made using two letters followed by four digits (0 to 9). If the letters are to be taken from six letters of English alphabet without repetition and the digits are also not repeated in a serial number, how many serial numbers are possible?
The letters used to represent unknown numbers in an expression are called