Question

In a survey of 200 students of a College it was found that 120 had laptop, 90 had calculator and 70 had mobile phone, 40 had laptop and calculator, 30 had calculator and mobile phone, 50 had mobile phone and laptop and 20 had none of these gadgets

1. Find the number of students of calculator and mobile phone but not the laptop.
2. Find the number of students of laptop and mobile phone but not calculator.
3. How many students have no laptop?

Answer 1

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