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2Question: A precision agriculture drone captures hyperspectral data across a 10 km by 10 km Australian field, divided into a 100-cell grid. If exactly 15 cells show signs of water stress, and 4 cells are randomly selected for immediate field inspection, what is the probability that at least 2 of the selected cells show water stress?
Let $ A $ be the event at least 2 stressed cells in 4 selected.
Total ways to choose 4 cells from 100:
Number of ways to choose 0 stressed (all 4 from 85 healthy):