How many have Bluetooth facility?
Answer: (2) 6
The total number of students in the class = 200
30% of the students in a class has mobile phones,
Then, the number of students who have mobile phone = 200 x 30/100
10% of the students who have mobiles phones have mobiles phones have a blue tooth facility.
Then, the number of students who have a blue tooth facility = 60 x 10/100
Hence, the correct answer is option (2) 6.