- A900
- B890
- C960
- D930
Step-by-Step Solution
By inclusion-exclusion: 500 + 400 + 300 - 120 - 90 - 100 + 40 = 1200 - 310 + 40 = 930.
Answer: D) 930
In a survey of 1200 people about newspaper reading: 500 read paper A, 400 read paper B, and 300 read paper C. Of these, 120 read both A and B, 90 read both B and C, 100 read both A and C, and 40 read all three papers. How many people read at least one of the three papers?
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