Casio CLASSPAD 330 3.04 - Manual (Page 761)

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S Cell-Calculation - count
Function: Returns a count of the number of cells in the specified range.
Syntax: count(start cell[:end cell])
Example: To count the number of cells in the block whose upper left corner is located at
A7 and whose lower right corner is located at C12, and input the result in cell A1:
13-7-5
Cell and List Calculations