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There are 200 students in a class out of which 40% opt for dance, 30% opt for music and 50% for debate as extracurricular activities. 28 of these students do not choose any activity. What is the maximum number of students who opt for exactly one of these activities?


Options:
A .   138
B .   104
C .   78
D .   none of these
E .   (a-b), (a+b)
Answer: Option A
:
A
S=120100×200=240

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