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Fifty people were asked about the health and safety protocols during COVID-19
pandemic: ECQ, MECQ, GCQ. The result shows that 18 prefer ECQ, 17 prefer MECQ, 15
prefer GCQ, 12 prefer both ECQ and MECQ, 9 prefer both MECQ and GCQ, 9 prefer both
ECQ and GCQ, and 8 prefer all three.
1. How many people prefer ECQ only?
2. How many people prefer GCQ?
3. How many people prefer ECQ and MCQ but not GCQ?
