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==Description==
==Description==
*This function shows the sum of the numbers.
*This function shows the sum of the numbers.
*In <math>SIGMA()</math> shows the sum of the first ten numbers.
*In <math>SIGMAOF()</math> shows the sum of the first ten numbers.
*Sigma is the eighteenth letter of the ancient Greek alphabet.
*Sigma is the eighteenth letter of the ancient Greek alphabet.
*As an upper case letter (Sigma), it is used as a symbol for sums and series.
*As an upper case letter (Sigma), it is used as a symbol for sums and series.