A biologist collects samples from 15 different plant species in the Amazon. She wants to analyze gene expression using combinations of 7 species, but 3 of them are highly sensitive and must either all be included or all excluded. How many valid combinations can she form?

Tue, 05 May 2026 21:31:49 +0000

**Unlocking Genetic Insights: How to Combine Plant Samples in the Amazon—Without Compromising Sens