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In a survey of 55 students, …

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In a survey of 55 students, it was found that 25 had taken mathematics, 22 had taken physics and 21 had taken chemestry , 12 had taken mathematics and physics, had taken mathematics and chemistry, 8 had taken physics and chemistry. If 12 students had taken none of the three subjects .find the number of students who had taken (A) all the three subjects. (B) only mathematics
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