Which customer loyalty program metric is mathematically equivalent to the concept of a 'geometric series' when analyzing lifetime customer value in mathematics educational product marketing?

In the world of mathematics education and products, marketing metrics play a crucial role in reaching the right audience. While mathematicians focus on formulas and proofs, companies selling mathematical products and services must understand their customers. This trivia question explores an interesting connection between mathematics education marketing and modern retail strategies. Can you identify the correct mathematical marketing insight?

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Customer Retention Rate with Discount Factor
Net Promoter Score Aggregation
Reward Point Accumulation Rate
Customer Acquisition Cost Ratio