Question 5
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A group of 4 is chosen from 10 people, two of whom refuse to be in the group together. How many groups are possible?
- A 28
- B 182 Correct
- C 210
- D 70
Correct Answer: Option B
All groups = 10C4 = 210
Both included: 8C2 = 28
210 − 28 = 182
Trap: 28 is the count to remove.
Answer: 182
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