Pooled testing: mix samples to identify the defective one

CAT has tested this idea 8 times across 2 papers, from 2020 to 2021. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2020 Slot 3 · DILR Q21	16 patients pooled into eight vials, one diseased	C
CAT 2020 Slot 3 · DILR Q22	16 patients pooled into eight vials, one diseased	B
CAT 2020 Slot 3 · DILR Q23	16 patients pooled into eight vials, one diseased	D
CAT 2020 Slot 3 · DILR Q24	16 patients pooled into eight vials, one diseased	B
CAT 2021 Slot 3 · DILR Q17	Bottles tested by mixing; impurity detected at 10%	A
CAT 2021 Slot 3 · DILR Q18	Bottles tested by mixing; impurity detected at 10%	1
CAT 2021 Slot 3 · DILR Q19	Bottles tested by mixing; impurity detected at 10%	2
CAT 2021 Slot 3 · DILR Q20	Bottles tested by mixing; impurity detected at 10%	A

Part of Venn & Set Puzzles (60 questions since 2017).