Which innovative packaging format, introduced in the 1970s, revolutionized how mathematical formula collections were sold to students?

Throughout history, the way mathematical knowledge has been packaged and distributed has evolved dramatically. From ancient papyrus scrolls to modern digital formats, mathematics publishers have constantly innovated to make complex concepts more accessible. This trivia question focuses on a significant packaging innovation that revolutionized how mathematical reference materials were marketed and used in educational settings.

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• The spiral-bound graphing notebook with tear-out formula sheets
• The pocket-sized mathematical formula cards on a ring
• The mathematical dictionary with color-coded sections
• The cassette tape audio tutorials with companion workbooks

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