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The letter that represent the composite number is letter C.
A letter used to represent a number is a variable of sometimes a constant.
o
variable
The number 11, (in hexadecimal) is the letter 'b'
Variable
b
Variable: A letter or symbol used to represent a number or quantities that vary
A letter used to represent a number is called a variable. Typically, the letters x and y are used, but technically you can use any letter of the alphabet.
A variablẹ
A variable
a variable