The class symbol of class 140-150 is- 9 | Mathematics MATHS | S CHAND | Doubtnut

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Size of the class 150-175 is

In Class XI of a certain school, there are 30 students in a Mathematics class and 20 students in Biolog class. Find the number of students which are in Mathematics class or in Biology class in the following cases: (i) Two classes are conducted at the same time. (ii) Two classes are condcuted at different time and 5 students study both the subject

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