Which mathematical constant is frequently used as a psychological pricing multiplier in premium mathematics education software, creating price points that are claimed to feel more 'mathematically harmonious' to customers?

In the world of mathematics education products, pricing strategies often incorporate mathematical principles to appeal to their target audience. This poll explores how one famous mathematical constant has been leveraged in product pricing psychology specifically for educational mathematics software and tools. Test your knowledge of this fascinating intersection between mathematical concepts and product marketing!

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The Golden Ratio (φ ≈ 1.618)
Euler's Number (e ≈ 2.718)
Pi (π ≈ 3.14159)
The Square Root of 2 (√2 ≈ 1.414)