In order to start a formula in Excel, you must start by entering "=", and then either select the cell you want to enter into the formula (ex. = A1 + B1) or simply type the numbers.
SUM - Adds a range of numbers together and returns the total sum.
AVERAGE - Calculates the mean of a set of numbers.
MAX - Finds the maximum value in a series of numbers
MIN - Find the minimum value in a series of numbers.
COUNT - Counts the number of cells in a range that contains only numerical value.
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