In a class of 100 ,84% of the students have taken politics &16% of student have taken history.how many students have taken both subject of all the students take at least one of these subjects?

2 answers

From your data, it looks like 84 took politics and 16 took history. There is no information to indicate how many took both.
If all students take at least one of the subjects, then no one took both, because 84+16=100.