Why are there three (3) default worksheets in MS Office Excel?

As far as I can remember there have been 3 worksheets ("Sheet1", "Sheet2", "Sheet3") by default in any new MS Excel's workbook. What is the reason for that? I'm pretty sure the most popular number of worksheets used by most users is 1 (come on, admit it). This bugs me and I keep deleting unused worksheets when I finish working with the workbook but most people don't. Those 2 unused worksheets actu

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当時の開発者が語る「なぜEXCELは3シートがデフォルトか？」。まとめると、1つだと誰もこの機能に気付かない恐れがあり、たくさんだとメモリー食い。3ぐらいがちょうどいい…という判断だったらしい。