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📰 But that seems flawed. Wait — unless each strain refers to prior categories, but still, 3 strains. So unless multiple samples per strain are allowed and one from each means at least one, but exactly contradicts multiple. Actually, exactly one from each strain means precisely one from A, precisely one from B, precisely one from C — total 3. But 4 are selected, so impossible. So no such arrangement. Hence:
📰 However, upon reflection: perhaps the question meant exactly one pair of co-strains or something else. But as written, the event is impossible. Therefore:
📰 But this is likely not the intent. Alternatively, reconsider: maybe each strain refers to 3 distinct strains, and exactly one from each is required, but with 4 samples, its impossible. So answer remains 0.
