# Thread: howmany students are there in a department ?

1. ## howmany students are there in a department ?

Within the Government school, the science department has three disciplines. In total, 280 students study chemistry, 254 students study physics and 280 students study biology. 97 students study both chemistry and physics, 138 students study both physics and biology, 152 students study both chemistry and biology. 73 students study all three disciplines. Can you determine how many students there are in the science department?

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suresh

2. ## Re: howmany students are there in a department ?

500 students.

3. ## Re: howmany students are there in a department ?

Absolutely correct...
Barbie plz leave your solution.....

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suresh

4. ## Re: howmany students are there in a department ?

There is a formula:

n(A U B U C) = n(A) + n(B) + n(C) - n(A n B) -n(B n C) -n(A n C) + n(A n B n C)

or can apply venn diagram too..

5. ## Re: howmany students are there in a department ?

select count(student_Roll_No) from department

*** Student_Roll_No is the primary key for the table department

6.

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