Excel SUM function

Function              SUM

Description        Excel SUM function returns the result of summation of a range of cells.

Syntax  SUM (number1, [number2], [number3], …)

number1  The first number to sum.

number2  [optional] The second number to sum.

number3  [optional] The third number to sum.

Usage Notes:

• The SUM function sums values input as arguments. It can sum up to 255 arguments.
• Arguments to be input as numbers, cell references, ranges, arrays, constants, and the results of other formulas or functions.